It's free and fun, containing many modes and guns (though some use a gambling lottery system to receive them. The game has some hackers, but not as much as many of the other fps that can be found (such as Combat Arms).
Tom: Hey Joe whatcha playin' there?
Joe: Oh, its called Alliance of Valiant Arms. Wanna see?
Tom: LOLLOLOLOLOLOLOLOLO U NUBCAKE COMBAT ARMS FTWWWWWWWWWWWWW
Joe:Fine, go play FaggotArms