there are lots of stuff on the Wii that are really fun
but sometimes it better to rent things then take someones word for it
but here are some games that i like:

zack and wiki
okami
dragon ball z BT 3 (or #2, same thing mostly)
sonic and the secret rings
SSB brawl
MK Wii

then other stuff i heard were good:

excite truck
endless ocean
elibits
metroid prime 3
guitar hero 3

and theres a few other things but yeah you got lots to pick from

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