I think GR was too hard on this game and I feel it is a major breakout come-from-behind hit that will be really big once more people experience it.
http://www.epinions.com/review/Left_4_Dead_for_Xbox_360/content_451719433860
The only reasons I'd donwrank this game is because of Versus mode only being available for the zombie players on 2 scenarios; lack of sophisticated puzzles: like, find a key or battery to open a door; and lack of gore rendering.
Otherwise, this game is absolutely fantastic, and a must have for FPS gamers this christmas.
I can think of no reason why you should not buy this game.
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