Now I can say, I´ve found a game that is really good. Combat arms.
It´s a FP-Shooter, like Counterstrike but for free. The graphics are good, there are nice versions to play (elemination, one man army, spy hunt,...)
But there are also disadventages: the game play many campers, spawncampers and hackers. but if you can handle those you´ll also have fun.