Tough one. It had alot of great games for players who knew what was going on; I'd love to look 'hip and cool' by saying Lost Winds (awesome game/s) but... Xenoblade I guess?

Silent Hill: Shattered Memories.

Xenoblade just edges out the Mario Galaxy game for me. Honourable mentions to Goldeneye 007, Super Paper Mario, Wii Sport resort and Donkey Kong country returns.

Xenoblade (10)
Super Mario Galaxy (7)
Super Mario Galaxy 2 (6)
Metroid Trilogy (4)
Mario Kart 6 (2)
Zelda Twilight princess (2)
Punch out (1)
Donkey Kong Country returns (1)
Zelda Skyward Sword (1)
Pandora's Tower (1)
Wii Sport (1)
silent hill shattered memories (1)
The Last Story (1)
007 (1)
Another co (1)
Super Paper Mario (1)
Trauma Center (1)
A boy and his slob (1)
Bully (1)
Silent Hill: Shattered Memories (1)

Xenoblade Chronicles.
That's an easy question as it's also my favorite game of all time.

PS : No one for Super Smash Bros Brawl ?...

Mega Man 9, if that doesn't count then Super Mario Galaxy 2.

*looks at list of games people have chosen.... dam those 4 people that have metroid trilogy!!! >.>

My favorite would have to be NSMB Wii.

I never understood why people get so hyped by that game.

Ive played the newest one on the Wii U, and im kinda left disappointed.

I just feel like other fighter games are much more fun to play. I would much rather play a Streetfight game than a Smash Brothers game, to be honest.

The two Zelda's and the two Galaxy games are my top four games, probably Skyward Sword as my very favourite followed by TP and then Galaxy 2 and last Galaxy 1.

But as my fifth game I would actually put Zack & Wiki: Quest for Barbaros' Treasure. And in this thread I will go with that game and vote for Zack & Wiki as my favourite game, just because it's really good and probably noone else will vote for it. :)

*high five*