You can try these games:
-House of the dead overkill
http://www.youtube.com/watch?v=6NVb_EE55AE
-Madworld
http://www.youtube.com/watch?v=rdqD7oTH6EM
-Scarface (if you like GTA)
http://www.youtube.com/watch?v=3zRozwtnWWc
-Manhunt 2 (hoho, if you have courage)
http://www.youtube.com/watch?v=GAIiN_sIBc8
-Pikmin 2 New play control
http://www.youtube.com/watch?v=TeN-Hkg2iyw
-Donkey kong new play control
http://www.youtube.com/watch?v=DYhf70z4S58
Sorry, i cant tell you more, i am playing these games, i am new in the Wii...
@Edit:
I forgot of these games:
-Trauma center (is something totally new, you have to try)
http://www.youtube.com/watch?v=HXbjD4p-hjw
-Fire emblem (a strategy game)
http://www.youtube.com/watch?v=NcavcNewIBM
-Excitebots
http://www.youtube.com/watch?v=Hht8wyPQVdQ (the quality of this video is a crap)
-Wario land: Shake it (is a pretty fun game)
http://www.youtube.com/watch?v=S49gYrN9zwI
-Rune factory frontier (excelent game, is a mix of RPG + Harvest moon)
http://www.youtube.com/watch?v=JKw8cquUYcU
-"Wiimake" of the Resident evil series (I don't like ports/remakes, but what can I do? these are good games...)
about the Punch Out! : You have to play the snes version, this is a great game and have great characters. I am excited about the wii version.
