The relationship between Kris Letang and Pittsburgh Penguins fans. Sometimes it’s complicated.

For more than a decade Letang has been a No. 1 defenseman for the Penguins, and for many of those years he has been a top-10, and at times maybe even a top-five, player in the league at his position. But there’s always been a sense (at least from this perspective) that he has never really been fully appreciated for just how good he has been, and the criticisms are always the same.

Turns the puck over too much.

Not good in his own end and takes too many chances.

Makes too much money.

Gets hurt too much.

There is an element of truth to some of that, but it doesn’t mean what his harshest critics think it means. Yes, he is guilty of turnovers at times. But so is every high-level player that plays a lot of minutes and always has the puck on their stick. Take a look at the NHL’s leaders in giveaways at the end of any season. It is a list of All-Stars. He does take some chances and at times gambles, whether it be pinching in the offensive zone or trying to make a play out of his own zone. But that is also a part of what makes him the dynamic player that he is. He is capable of doing things and making plays due to his skating and skill that other players not only can not make, but probably can not even attempt.

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It basically comes down to this: He is going to make some mistakes, but as long as the positive plays outweigh the negative plays you have to to take the bad with the good.

Sometimes his freakish athletic ability makes it possible for him to wipe out his own mistake with a brilliant play of its own.

And while he has missed a significant portion of his career due to injury, he’s probably been a little underpaid given the market rate for top-pairing defenseman that play at his level.

But because the bad plays are usually the result of that aggressiveness they will stand out more. And because hockey is a game of mistakes, we tend to focus almost exclusively on that big mistake when it happens and allow it to drive the discussion around that player.

That brings us to Letang’s 2017-18 season (and postseason) for the Penguins. To be fair, it was not a great season, and it reached its low point in Game 5 of the team’s second-round series when a third period breakdown allowed Evgeny Kuznetsov to score a game-tying goal just one minute into the third period, completely changing the direction of the series. The series ended with Letang trying to chase Kuznetsov down from behind on a breakaway as he potted the series-clinching goal. Viewed in the context of the Penguins actually winning the Stanley Cup a year ago without having Letang for any of the playoff games, it made him a focal point for blame when the team did not win this season (nevermind that they probably do not win that Stanley Cup the previous year without him, this is the ultimate what have you done for me lately business).

What made this season even tougher for Letang is that it wasn’t just the mistakes of aggressiveness or the Game 5 blunder against Kuznetsov that made it an off year for him. He seemed to get beat in one-on-one situations more often than usual. He also saw a pretty sharp decline in his offensive production and by the end of the year and playoffs was replaced by Justin Schultz on the team’s top power play unit.

Physically, Letang has been through hell and back in recent years due to both injury and health issues.

The most recent example was the neck injury that sidelined him for the second half of last season and all of the playoffs.

On Wednesday’s locker clean out day in Pittsburgh, Penguins coach Mike Sullivan said he had an inclination that the injury, surgery, and recovery in such a short period of time was probably going to be a lot for Letang to overcome.

He also talked about the inconsistency.

“He had stages of the year where he was really good for us and stages where he wasn’t at his best,” said Sullivan. “By no means does it diminish what we think of Kris as a player. He’s a guy that we think is certainly one of the elite defensemen in the league.”

Letang himself admitted that he thought it would be easier to come back and that he might have lost a little bit of his conditioning.

The thing about Letang is that for all of the struggles he had at times this year there were still elements of his game that were in place.

Fifty-one points in 79 games was a down year for him. That still placed him 17th in the league among all defenders in the NHL.

When he was on the ice the Penguins attempted more than 55 percent of the total shot attempts during even-strength play. Among defenders that played at least 500 minutes of 5-on-5 ice-time that was the 12th best mark in the entire league, so the team was still controlling possession and the shot chart, which should be seen as an encouraging sign. Players that help drive possession that much usually see that pay off when it comes to goals for and against. But of the top-20 defenders in the league in shot attempt percentage, Letang was one of just five that had a negative on-ice goal differential on the season. The other four (Jaccob Slavin, Justin Faulk, Noah Hanifan, and Brett Pesce) all played for the Carolina Hurricanes, a team with infamous goaltending issues.

Part of Letang’s issue when it came to goals for and against was his own inconsistency.

Another part of it was the Penguins’ inconsistent goaltending, both from starter Matt Murray when he was healthy, as well his revolving door of backups that all struggled. Improved play from that position would go a long way toward correcting both his and the Penguins’ 5-on-5 issues as a team (because it wasn’t just Letang that struggled in those situations for the Penguins this season).

In the end, though, he is capable of more than he showed this season, and everybody involved knows it.

That is why no matter how much criticism he takes, how many times there is a call for the Penguins to trade him, they are not going to do it. They shouldn’t do it, anyway. Because when Letang is right and on top of his game there are only a small handful of players in the NHL that are better than him at his position, and you are never going to get that upside back in a trade.

Especially now when his value is probably at an all-time low given the injury recovery and the fact he is coming off of a down year. Part of what made the Penguins such a success the past few years was pouncing on trade partners that were dealing players at lower value (Phil Kessel, Carl Hagelin, Nick Bonino, Trevor Daley, and Schultz all come to mind). The good player usually rebounds. The good — and smart — teams usually make sure it happens for them and not somebody else.

Given his track record there is every reason to believe he can — and probably will — get back to that level.

The Penguins should be more than willing to take that bet that he gets there next season.

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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.