Although a standard first-person shooter in many respects, memorable characters and varied worlds keep experienced players interested. The idea of traveling through time sounds great, but this aspect is only moderately interesting. The worlds are imaginative, but they aren't grounded in reality and players don't get the sense that they are actually traveling to a different time period. The enemy AI is average, but the weapons have a realistic range that enhances gameplay.

This would be a great game for younger players if not for the violence, which is intense. A flamethrower in certain scenes ensures screaming deaths; bodies are enveloped in a cloud of blood when shot; and blood pools on the ground. Parents should be aware of Vampire Mode, where the player is able to restore health by killing other players. Parents should take great caution before allowing younger teens to play online: Because of the game's violent nature and M-rating, your kid is likely to play with much older players.