Just played the Arkham games again and I go back to Infamous, Uncharted, Ratchet, and GoW at least once a year (every game).

Spyro 1-3
Ridge Racer 1
Future Cop LAPD
The Sims
Command & Conquer: Tiberian Sun

Tomb Raider 1 and 2 (PS)
Soul Calibur (Dreamcast)
Crazy Taxi (Dreamcast)
God of War series(PS2,PS3,PSP)
Ratchet and Clank series(PS2,PS3,PSP)
Metal gear solid peace walker(PSP, PS3)
Killzone 3

Smash Bros Melee - the best fighting game of all time
I can't think of another game :(

AudioSurf - Whenever I get a batch of new music, an AudioSurf session won't be far behind--and then I always find myself playing previous favorites, as well.

Fallout 3 & Fallout New Vegas: Exceptional games with so much content that you can play different ways. The last time I played Fallout NV, I went straight evil and wiped out the first town, including a few quest-givers. Also, Old World Blues, my favorite DLC ever, is fantastic to play over. It's like being in an episode of Dr. Who. On top of that, mods. Mods are awesome.

Final Fantasy Tactics - My most played game ever. Love the combat and the challenge of getting everything. LOVE Deep Dungeon.

Bloodrayne & Bloodrayne 2 - Shut up.

Might & Magic: Clash of Heroes - I really like the battles. The story and characters are good, as well.

Also, Scrabble, Chess, and World of Goo.

Borderlands 2

Persona 3 and 4

Most Ratchet and Clank games

Typically platformers. They just never get old.

The metroidvania games I played them all two or three times!
I beat Ocarina of Time 3 times already!
The games I repalyed the most are the Mega Man X series. I must have beaten 5 times each one. Except X7 and X8, X7 I beat it once and it was enough, and I never beat X8!

Final Fantasy X-2
Rings of Power (Naughty Dogs greatest game)
Killzone 2

Mario Kart Wii
Super Smash Melee
The Legend of Zelda: Twilight Princess
Roller Coaster Tycoon