That depends on what genre your asking for.
online multiplayer
I would have to say Halo3 or any CoD game.
I don't have this game but i have heard that its really challenging i think you need xbox live to play multiplayer
if you want to play multiplayer on the xbox 360 you can with and without connecting to xbox live. some games you have to connect to xbox live and some you don't. when you buy a game look at the back of it and it should tell you.
How do you unban multiplayer on your xbox 360
The Xbox 360 has the best library of multiplayer action games.
It would depend on the game that's being played ...
yes i think so
No.
xbox or xbox 360
You have to first update the game over xbox live
A good game is COD3