Some cool action games are "Samurai Rebellion," "Earth Taken 2" and "Band of Heroes." These are all online action games that are free to play.
"Samurai Rebellion" is a strategy game that takes place after the civil war in 1604. Japan is at peace during the game and the player is one of the local warriors that protect the residents.
In "Earth Taken 2," the player is part of a post-apocalyptic world. This is an action-shooter game that requires the player to battle aliens that have invaded the planet.
"Band of Heroes" is an online game in which the player plays as Josh, a rogue that finds treasures and artifacts. He has friends that help him get out of trouble while getting treasure.