You got that right. 16 bit systems weren't advanced enough to handle Mutant League, the football was slow and studdery, although the hockey game was pretty playable. I'd KILL to have half the sports franchises we used to have, fantasy sports still have an audience and now that they can be done properly all we get is Madden and two basketball sims.
What happened to Mutant League, Blitzball, Arch Rivals and games of that ilk? Sports games take themselves WAY too seriously, I guess we still have Blitz the League but I'd LOVE a return of Mutant League.