5 platformers, eh?
-New Super Mario Bros wii ("the new Mario" actually refers to Galaxy 2 nowadays...or even sports mix. sorry if you already have this one)
-Muramasa: the demon blade. Lots of hack 'n slash with a more-than-average RPG element, but quite satisfying. and beautifull.
-wario land: the shake dimension. Perhaps a bit short, but it has lots of hidden stuff.
-Kirby's epic yarn. Except if you want a challenge, as this game is fun but waaaaay to easy (though honestly: I think you could actually pick up chicks with the line "hey darling...you wanna play co-op Kirby's epic yarn with me?").
-Super Smash bros brawl (yeah, yeah...lots of fighting...but the subspace emissionary is far more than a minigame-addition).
For runner-up, I'd say Super paper mario. It's fun and creative, but that paper mario thing never got the same smile on my face as a "real" platformer.
Outisde the classic platformers, I'd go with Zelda, Okami or Super Mario galaxy (1 or 2). For on-rails shooters, I prefer sin & punishment 2 over house of the dead overkill, but that's mostly on preference (HotD is more grindhouse, S&P2 is more bullet-hell).
If you have more than 1 wiimote, New super mario bros or mario kart wii becomes exponentially better.