Critic, all I can say is that if you do try to play them again, maybe turn off items, or even do the practice mode. Also, avoid moving stages like Big Blue, Pokefloats, and the Ice Climbers stage. Then you can learn to play without it feeling as hectic and button-mashing oriented. If you're good at rolling (hold block and press left or right on the joystick) the game is a lot more fun. My favorite characters are the sword holders: Marth, Link and their clones. I think you should give the games another try.
I'll join Alienblue in the broken record club. Please re-review Pole Position 2. First play the horrible to control version on one of the compilation discs (but look to see if the 7800 version does in fact emulate the arcade game well). Also, play Hang-on on SMS and remember that that too is a pack-in game. That should put you in the proper frame of mind. Try your very hardest not to judge Pole Position 2 on if it is, in fact, Super Mario Bros. as very, very few games ever made would come out looking very good in that comparison.
Baseball stars 2 should be re-reviewed. Majority of fans of baseball stars including myself think the sequel is awful. Baseball stars is clearly superior should get an A while the sequel is a D+ title.
As for a couple of reviews I don't agree with I would have to go with Mutant League Football and Mutant League Hockey. Those games are cult classics and Mutant League Football has arguably aged better than any other Genesis football game. Its seriously the one of the few I can still play with friends. Plus the large detailed characters look fantastic even today. For the most fun play with "deaths on" and the death index set to 3.
Mutant League Hockey isn't nearly as bad as you make it out to be. It wasn't a good as Football, but it certainly didn't warrent the unplayable-like score you gave it.
Finally I think you should go back and re-review Return Fire. You completely missed the boat on that one. You try to compare it to something like Mass Destruction (Saturn) when it has nothing in common with that game other than the fact that you can use a tank. Return Fire is a bonafide multiplayer classic, full of deep strategy and tense gameplay. You should review the PS1 version since its sort of a "greatests hits" package.