liboo - so far I haven't encountered bad Wii controls except in one respect, which I'll get to further down. Mario Kart Wii - the controls are fantastic with a Wii Remote and nunchuck and actually I really like the game with the Wii Wheel. We have GC controllers but none of us have even wanted to use them with it. Super Mario Galaxy plays great. Animal Crossing - the controls work well. Super Paper Mario - I haven't played it a lot, but for the bit that I have, the Wii Remote scheme worked well here too and my son is having absolutely no difficulty with it. I can't see the need for a GC controller with it, and the searching with the remote feature is pretty cool. So, I guess I'm not seeing where there is any evidence that the controls don't work. In fact they work well. However...
... there is a case where the controls don't work, and maybe this is the source of the problems you've had? The Wii remotes are too sensitive to light. In fact, we found that with our Christmas tree lights on (the Christmas tree is right next to our TV), the Wii is virtually unusable. That's because the Wii remotes think all those gazillion lights on the tree are all the Wii sensor bar and it goes crazy! Moreover, where we have the TV set up normally, there are two small, square windows, one up and to the left of the TV and one up and to the right of the TV, but with the xmas tree up we have to push the TV under the left window. Well, in the mornings the light comes in that window and that messes up the Wii remotes too! I had to cut out a square piece of cardboard and block that window so we could more easily play in the mornings. I'm pretty disappointed in how picky the Wii is about light, but if you get it set up right, it does work great.
EDIT: Also FPS on consoles have always been completely unplayable for me - analog sticks for FPS suck big time. I haven't had the chance to play MP3 yet, but I do have hope that the Wii Remote scheme will be the saving grace for console FPS's. Of course, I'm a bit tired of FPS anyway, so I'm not really all that excited about it, but when I can pick it up cheap I'll get it.