Grading an NFL Draft class immediately after its selection is a ridiculous endeavor. But people read plenty of ridiculous things about the draft, so ESPN's Mel Kiper Jr. eagerly spits out grades right after the draft is complete.

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It typically takes three seasons to accurately determine how a draft class worked out (or didn't). And here's how we graded the Jets' 2013 draft class after three seasons.

On Wednesday, Kiper took another stab at his 2015 draft class grades. What did he think of the Jets' class?

Well, he upgraded the class from an A-minus (his immediate post-draft grade) to an A. This isn't exactly scientific stuff, folks, but here's how Kiper explained himself:

The last sentence in my draft grades write-up was this: "And remember: I factor Brandon Marshall into this draft." Well, for a sixth-rounder [in a trade with the Bears], all Marshall did was deliver an All-Pro-caliber season (in my book) with 109 catches, 1,502 yards and 14 touchdowns. Not too shabby. The Jets also have my defensive rookie of the year in Leonard Williams, whom they got at No. 6 even though he was No. 1 on my Big Board. Lorenzo Mauldin really came on down the stretch, and Devin Smith had flashes before he got hurt, though he looked raw. Something worth noting: Plenty of Jets fans wanted them to grab Kevin White of West Virginia at No. 6. They went with Williams. White didn't play a down this season and Marshall was a star. The front office deserves a lot of credit.

Jets general manager Mike Maccagnan, a rookie in that job last year, has repeatedly said that drafting Williams at No. 6 was a no-brainer pick -- in keeping with Maccagnan's "draft the best player available" philosophy.

The Jets already had Marshall and Eric Decker when they drafted last spring, so they didn't really need to use the No. 6 pick on another receiver, White, whom the Bears took at No. 7. Maccagnan was pleasantly surprised when Williams fell into his lap at No. 6. It was an easy decision for Maccagnan to pick the defensive end.

As it turned out, the Jets did just fine with Marshall and Decker carrying their passing offense in 2015, with minimal help from other receivers, including Smith, the second-round pick who played in 10 games and caught nine passes.

If you want to check out more draft grades, here's how our Dom Cosentino graded the Jets' 2015 draft, after the season.

Darryl Slater may be reached at dslater@njadvancemedia.com. Follow him on Twitter @DarrylSlater. Find NJ.com Jets on Facebook.