FPSG writes: "Like its predecessor, Left 4 Dead 2 is a sort of hyper-violent personality test masquerading as a cooperative zombie survival shooter. If you want to know which of your mates you should trust with the water bottle after shipwrecking on a desert island, simply invite them over for a bout and let the game's dynamic challenge factor weasel out hidden traits and flaws, profiling each player in sickly green strokes of undead gore.
Where other shooters are static, unreactive structures, brittle sandcastles awaiting the casually lobbed football of human intervention, the Left 4 Dead games give exactly as good as they get, altering the quantity, quality and positioning of enemies, weapon drops and obstacles in response to player behavior. Lone wolves will be pounced upon by terrifying cat-like Hunters, cowardly hangers-on showered in Horde-attracting vomit by repulsive Boomers, layabouts lassoed and dragged off by elusive Smokers. After half an hour's play, you should have a lot of stories to tell and a couple fewer names on your Christmas card list."