what should i get as my first game for the xbox 360?

[Ty Cobb]

Halo 3 definitely. Also try Rock Band or Guitar Hero.

[American Idol Addict.]

Dead Rising I heard it is so cool because you are in a mall get to use anything and everything as weapons to kill the zombies.

[<!>1 Ju$t WaNt P01nTz<!]

call of duty 4

[Krilov]

Look at this:
http://www.testfreaks.com/xbox360-games/?sort=score
Here is the rating of the best XBox 360 games. Games scores based on expert and user reviews from all over the world.
I think this is the most objective way to find the best one.
Top 3 games by this rating are:
1. Grand Theft Auto IV
2. Half Life 2: The Orange Box
3. Bioshock
My opinion is to try one of them firstly