Get Rock Band, you'll never go back.

don't buy a game til the Call of Duty 4 number 2 comes out.
their working on it.

You should try Fallout 3. That's about as sand-box as you're gonna get. It's also got some shooter and RPG elements to it.
Definitely check it out. Way worth a rent, even a buy if you like it.

My favorite games (i'm fussy) are Motor Storm (first one) and Rainbow six Las Vegas.

Metal Gear Solid 4, I love the MGS series despite how crazy the story had become in MGS2. Pity I dont have a PS3, I went the way of the 360. Hopefully MGS4 will come to the system soon.

I love first person shooters and this game called 'team fortress 2' is so fun. you play online with lots of other people and the characters are cartoons and you can pick from several different characters. It's a protect and conquer game. I don't know why but it's super fun. You buy it with other games on the disc it's called 'The Orange Box'.

The best level is called 'The Dustbowl'….if you buy it remember that.

Madden 09
Resistsence 2
U might like gutair hero world tour or rock band

Well, the ones you've already named are great games :D, although for Assassins Creed I would like to warn you, once you beat the game the game gets very boring and you won't want to play it anymore. (Just letting you know, I got bored very easily of it) If you like creative like games that almost everyone loves then I would suggest Little Big Planet because it is a very great game and has good ratings. Also, I can't stop suggesting Guitar Hero/Rockband since it is very good. (if thats your thing)

Good luck finding your favorite game

i'm pretty sure choosing a game you like is really up to you.

rock band 2 , rainbow six vegas 2 5* * * * *