I think Punch-Out!! is a pretty fun game at the earlier levels, I especially enjoy kicking the snot out of that don flamenco fellow, but once you get up past the japanese guy it's downright unplayable. I think Mike Tyson was unbeatable in the original demos. They were afraid he might come to their houses and rip out their intestines to wear as a tasteful scarf if they made it so he could be beaten. But, in the end they had to man up and face their fate, because you can't get the Nintendo Seal of Approval with an unbeatable game. And man, back in the day, that Seal meant something.
EDIT: Oh, we're talking about the one for WII? never played. I hope it's still got the indian dude that goes in ultrafast circles.