it depends on what your looking for, if your just after achievement points then there are tons of games you could play for an easy 1000gs a piece like: Sherlock Holmes vs jack the ripper ,any csi game and the slew of "kids" games available through gamefly.
if your after games like mw3 and frontline you may want to check out some of the other fps games on the market like syndicate,rage,bioshock and a ton more just click the shooter tab.