Success at a championship level in professional sports is not only a rare and short-lived thing, it also tends to be quickly and easily forgotten when the winning stops. Or at least when it slows down. So with that in mind we really need to talk about the Pittsburgh Penguins because this is a team that seems to be quickly trending in the wrong direction.

Just two years ago they were doing something that had not been done in the NHL in two full decades by winning their second consecutive Stanley Cup, capping off an incredible run of hockey that was driven by a core of superstar players and a series of roster moves that worked out to near perfection. The acquisitions of Phil Kessel, Nick Bonino, Matt Cullen, Trevor Daley, Carl Hagelin, and a host of call-ups from the AHL were all home runs (or close to it), resulting in a stable, successful roster with very little turnover from 2016 to 2017. Other than the additions of Jake Guentzel (call-up) and Ron Hainsey (trade), it was mostly the same team.

But following the 2017 championship the salary cap, free agency, and what has seemingly been a curious change in direction from the recipe that produced back-to-back championships has stripped the team of most of its depth, and the front office has badly struggled to replace it. The result has been two years of constant roster shuffling that has left the team on the playoff bubble and facing a daunting stretch run that includes six games against the teams they are competing with for a playoff spot (three against Columbus, two against Carolina, one against Montreal) and a number of games against some top-tier teams. Those head-to-head matchups will go a long way toward making or breaking their season, which is a stunning thing to be saying about this team with this core in late February.

Making matters worse in the short-term is the fact they are currently playing without three of their top-four defenders as Kris Letang, Brian Dumoulin, and Olli Maatta are all sidelined for an undetermined amount of time. That situation likely had at least a little something to do with the continued roster shuffling at Monday’s trade deadline when they flipped Tanner Pearson to the Vancouver Canucks for Erik Gudbranson.

The move was not well received by … well … anyone.

The focus of the criticism has been centered around what Gudbranson can actually bring to the table. Objectively speaking, his career performance has not lived up to the status of a former top-five draft pick. His underlying numbers are among the worst in the league at his position, and the eye test isn’t any more forgiving.

By Gudbranson’s own admission on the way out of Vancouver he was not good enough during his time there.

There is legitimate cause for concern with him as a player.

But focusing on Gudbranson misses the bigger problem in Pittsburgh right now, and that problem is that over the past two years nearly every single roster transaction the team has made has been a failure.

In some cases a spectacular failure.

[Related: Pearson for Gudbranson trade looks ugly for Penguins … on paper]

We know this is true because they keep having to make more trades to undo all of the roster transactions in an effort to correct them.

The cost the Penguins paid to actually get Gudbranson from Vancouver is irrelevant. I don’t know of any other way to put this without sounding like a jerk — so I will just say it and sound like a jerk — but Tanner Pearson is a mostly forgettable, run-of-the-mill NHL player. He might score 15-20 goals for your team, he might finish with 40 points, and within a year of him being on your roster you will probably forget he was ever on your roster until you go down a Hockey-Reference rabbit hole and say, “oh, hey, remember that guy?”

But the Penguins had just acquired that guy two months earlier in exchange for Carl Hagelin, a move that in hindsight looks like it was only done to shake up a core that had maybe gotten too comfortable with itself. Hagelin had his flaws as a player, but he was a huge part of the team’s identity, a popular player in the locker room, a player who won championships with the team, and a player who could still play a capable shut down role and bring the type of defensive conscious so many of the team’s forwards currently lack.

That is not nothing. He was also an expiring contract after this season. Put it all together and that means within a span of two months the Penguins turned a somewhat useful player that was still a part of their identity and what would have been $4M in salary cap space next season into a player whose potential contributions are suspect at best, detrimental at worst, who will be taking up every penny of that salary cap space in each of the next two seasons.

Pearson’s arrival and almost immediate departure was the eighth time since the start of the 2017-18 offseason that the Penguins acquired an NHL player and then jettisoned them within a year.

It is not unfair to look at that list and that series of transactions and come to the conclusion that there is a problem somewhere in the organization, whether it is with the pro scouting, or with the coaching staff, or with the final decision-making, or with what they are looking for in players. Something is clearly off here. What other conclusion can you possibly come to?

A team that just two years ago was winning with speed, skill, and puck-moving defense keeps trying to find grit and toughness and keeps making itself slower and less mobile.

The one transaction that was made during this stretch that hasn’t yet been undone, the signing of Jack Johnson, might be the most damaging of the bunch and it’s probably only a matter of when, and not if, that ends in a buyout or a trade.

This much roster turnover and shuffling of players can not be a sustainable way to run a franchise, mostly because it doesn’t even take into account the collateral damage that has come with working to “fix” those trades. They lost Conor Sheary, Hagelin, Ian Cole, and Oskar Sundqvist as part of those transactions, and have also given up a boat load of draft picks and a top prospect (goalie Filip Gustavsson) along the way.

As of now, they have gained Jared McCann, Nick Bjugstad, and Gudbranson out of it all, with the latter two taking up more than $8M in salary cap space over the next couple of years for a team that is already pressed against the salary cap because of their superstars. Will they be worth it? And what other trades will have to be made and what other assets will be given up if (or when) they are not? Because if recent history is any indicator there is almost no chance they finish their current contracts wearing Penguins uniforms.

Maybe they don’t make this latest trade for Gudbranson if the injury situation isn’t what it is. But even with that it’s bizarre to try and plug a short-term hole by acquiring a player with this on-ice track record with this much term and this much money left on their deal. There are other ways to plug a hole without tying up significant cap space in future years.

And quite honestly, if Gudbranson’s play doesn’t show dramatic improvement upon his arrival in Pittsburgh there is an argument to be made they would have been better off just staying with what they had. They might have been better off had they simply done nothing since the start of last offseason because at least then they might have more salary cap space, more assets to deal from, and it’s hard to imagine their spot in the standings being any worse because as of now they are only going as far as Sidney Crosby, Evgeni Malkin and a healthy Letang can carry them.

Rutherford has built three Cup winning teams in the NHL, and that is not only a big part of his story as an executive, it commands respect. It will probably be enough to someday get him a call to the Hall of Fame (how many three-time Cup winning general managers are not in?)

But it doesn’t leave him above criticism when it is warranted.

Based on where the Penguins are and the series of moves that have been made over the past two years the criticism is definitely warranted because his team looks like it doesn’t know what it is, where it is going, or how it should get there.

MORE: Winners and losers of the NHL trade deadline

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Adam Gretz is a writer for Pro Hockey Talk on NBC Sports. Drop him a line at phtblog@nbcsports.com or follow him on Twitter @AGretz.