Battlefield Heroes aka BFH. A Play4Free game for gamers, who doesn't have the money, or doesn't want to pay.
A cartoon version of FPS. I like this game. This game have approved so much. I can assure you, this game is very fun. They got a big community, and yesterday they celebrated their goal: 10 millions players. During the celebration everyone got 100 Battlefunds, which is gold, you can buy in-game stuff with. They also gave out two shirts for each player. They started this idea, called "The Claw". It's basically a "give away" game, which gives you random in-game stuff.
Link:
http://www.battlefieldheroes.com/en/This game is very trusted, thus it's made by EA, so don't worry. There is no chance, you'll get virus from this game.
Enjoy.