Definitely get Diablo 3. It's way better than it was on PC.

For Wii:
Arc Rise Fantasia (JRPG)
Spyborgs (action)
Wario Land: Shake It (platformer)
Muramasa: The Demon Blade (action)
Zack & Wiki (puzzle)

PS3:
Rayman Origins/Rayman Legends (platformer)
Ratchet & Clank: A Crack in Time (action)
Castle of Illusion HD (platformer) It even has the original Sega game.
DuckTales Remastered (platformer)
Zeno Clash 2 (first-person action)