Xbox 360

The Legend of Zelda: Ocarina of Time
Resident Evil 4
Red Dead Redemption
Resident Evil 2
Batman Arkham Asylum
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DmC: Devil May Cry on Intel HD 3000
http://www.youtube.com/watch?v=idcji9WWsjA

Like SunDevil, my list constantly changes.

So 5 Games That I Would Take to a Desert Island...

1. TES V: Skyrim
2. Fallout 3
3. Spiderman: Web of Shadows
4. Actraiser (SNES)
5. Saints Row 3

Honorable Mentions:
GTA IV
TLoZ: Ocarina of Time
Skate 3
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Every time I post, a Mud Crab eats some bandwidth.
Hail HYDRA!

in no order

Final fantasy 10

dark cloud 2

Assassin creed 2

kotor 1

Cod 4

Legend of Zelda: Ocarina of Time (The game that really opened my eyes to large scale fantasy worlds with multiple races, each with their own specific culture and appearance)
Final Fantasy X (He might be a love or hate character, but it was impressive watching Tidus grow from a cocky show-off to a caring, brave guardian, willing to sacrifice everything to save his friends and Spira. Plus the kiss between Tidus and Yuna is one of my most favourite scenes of any media of all time)
Star Wars: Knights of the Old Republic (HK-47's definition of love for starters, and his definition of organics, and his urge to kill everything as violently as possible and... well really anything HK-47 has to say really)
Bioshock 2 (I love the relationship between Delta and Eleanor)
Mass Effect 2 (I felt that the changes to combat made Mass Effect 2 feel more personal than it did in Mass Effect 1 as well as the story feeling more connected to Shepard. Plus Scientist Salarian!)

Runner-ups

Gears of War Trilogy (Having read the books and comics as well as playing the games creates a multimedia experience with believable characters and a wide range of emotional moments)
Bioshock (The opening alone is a piece of genius and Armin Shimerman's voice work as Andrew Ryan is masterful)
Mass Effect 3 (Finally getting even with Kai Leng and the final assault on Earth)

1) Dragon Age: Origins
2) Kingdom Hearts
3) The Elder Scrolls IV: Oblivion
4) Mass Effect
5) Pokemon Crystal

Those feelings of creating my first character in Dragon Age, walking into Traverse Town for the first time, storming the Oblivion Gate at Bruma, meeting Sovereign for the first time, or hearing the music of New Bark Town for my first time as a kid can never be replicated.