You know, the ones who have done a lot but never seem to get recognition even if they are in their respective halls of fame?
The first one that comes to my mind is Marcel Dionne. 731 goals plus 1040 assists for 1771 points is the best for someone not named Gordie or Wayne yet he seems to get passed over a lot because he played most of his career for the Los Angeles Kings when they were crap.
I don't know if it's just bias because I have his autograph, but I'll always consider Bobby Doerr better than his teammate at Boston, Ted Williams.
And if Ted were alive still, he'd agree actually. Doerr didn't get to play as long as Ted due to injuries ending his career way early. But Doerr had many of the team records before Ted shattered them later, and when they were teammates, Ted was really the only one to recognize Doerr's talent.
Clinton Portis is not really remembered because he played on some truly bad Redskins teams and battled a lot of injuries his last few years, but he's still just shy of 10000 rushing yards, was a pretty good receiver out of the backfield, and was one of the most ferocious pass protecting blockers from the RB position that there's ever been. Awesome player.