I won't look, but I'm going to pause and think anyway because I've got a lot of games and I have to remember which ones did what and with who in the pantry with a candlestick... oh... wait... Hm...
Left 4 Dead 1/2 - Pretty much the same game, one expanding upon another. So they both take one spot.
Portal - Um... nuff said?
Sonic Adventure 2 - My favorite Sonic game. Got a problem with it? Find someone who cares.
Pokemon Diamond - Generation 4 games are probably the most balanced thus far and Sinnoh (along with its Pokemon) were actually a decent addition to the franchise.
Metroid Prime - This is how FPS should be done on a console.
SSBB (Minus) - Brawl only makes my list if we're allowed to mention the Minus-Hack which alters movesets, allows for custom characters, stages, outfits, etc. It's essentially everything Brawl should have been and more.
Arkham Asylum - So... damn... awesome. Proof that anything Mark Hamill is in is gold. It's like the Will-Smith-Effect. I just wish the thrill ride could have been longer.
StarFox 64/Assault - I honestly can decide which I like better. Both games are pretty good and offer something different to the StarFox table. I'd be willing to put the whole franchise on here if StarFox Command didn't kill it by being shit.
Soul Calibur II - So many epic battles. Nightmare vs. Nightmare with a friend lasted nearly 1/2 an hour. Probably the best game in the series, just before costumes started getting ridiculous and plot started becoming impossible to follow at all.
Fire Emblem: Path of Radiance - Probably the Best Fire Emblem game I've played thus far and probably one of the best Turn-Based strategy games I've ever played. The only problem I have with it is that there are no Dark-Magic-casters. I miss them from the other titles.