3. Paper Mario
5. Animal Crossing
6. Mariokart DD
7. Mario Smash Football
8. Mario Golf
9. Mario Tennis
10. Monkeyball 1/2
Probably more that should be in there but i can't think of em right now.
edit : Resident Evil 4. Crikey where am I gonna put that??..... Should be in top 5 definetely.
EDIT1.2 : CRAP! Forgot about Four Swords too! That was awesome 4 player!
Edit(again!) - Viewtiful Joe too!