Oblivion. Turned out to be a great decision.

Dead or Alive 4. Good fighting game for a console's launch, but it's taking its toll over time now(played it too much before).

Call of Duty 2 a couple days after launch.

"Dead or Alive 4. Good fighting game for a console's launch, but it's taking its toll over time now(played it too much before).
"

Perfect Dak Zero. I was a good game when it was released, but it hasn't aged very well.

Bought the console with Perfect Dark Zero and Kameo, followed that up with Fight Night, GRAW and Call of Duty 2.

Gears of War, awesome but multiplayer bugged me after a while.

Hexic.

My first was crackdown.

PGR3.  It was okay on my opinion, then I got Gears of War and Viva Pinata. Those were good.

The one game that left my mass erect.  I'm speaking, of course, about Deadliest Catch: Alaskan Storm.

Seriously though, it's Mass Effect; I don't crab.

"Dead or Alive 4. Good fighting game for a console's launch, but it's taking its toll over time now(played it too much before).
"

Vegas 1, first game I played on Xbox live as well

All 3 of mine came in a bundle, i got Gears of War, Crackdown and Prey. Gears being the only good title there.

halo 3. it was magical ^_^

Gears of War.

FIFA World Cup 2006
It was horrible.

Gears of War.
Probably the game I spent most time with as well.

Oblivion was my first 360 game.

The first game I played on my 360 was Hexic HD, The first game I bought was Dead Rising.

King Kong and Call of Duty 2.

My first 360 game was gears of war but my brother had many others before it however i stole my brothers 360 and bought gears

The first I *played* was Transformers. Though I bought SDVR: 07, Transformers, Gears of War, and some RTS (?) LOTR game at the same time. The only one I still have is GoW, heh.

Gears of War... awesome

GRAW 1,it lasted 2 months for me

Oblivion

PGR3 was packed in with my 360 and I had to suffer with that for a while till I got Dead RIsing which is what I consider my first game.

I remember I had to buy a bundle from Best Buy back in April 06.  I'm positive that I picked GRAW as my first game.  I really did enjoy it, but late last year I traded it in for COD4.

Got Rainbow Six Vegas and Madden 08. Vegas was fun Madden was not.

PGR3, like almost everyone else who got one at launch.

I think NHL 07 was the first one that I bought.

Gears of War.

Perfect Dark Zero, still one of the best shooters on the console IMO

Earth Defense Force...PSHYEA

For me it was SmackDown vs Raw 2007 and then Saints Row. Good games. 8)

Call of Duty 2

Call of Duty 2

Need For Speed Carbon

PGR3

Actually I was wrong it was crackdown for me.

Gears of War and Tomb Raider Legend, but I mostly played a lot of Halo 2 at the time since I didn't get Live until 360 and I was having more fun on Halo 2 online then Gears online haha.

Gears of War and GRAW 2 were my first games with my newly purchased 360.

quake 4 back at launch

"The one that came with it (MUA and Forza 2) but the first game I bought for my 360 was Halo 3
"

PDZ, and I still own it. It wasn't that bad. It lasted me until Oblivion game out.