How bad is it? It just might be the most derivative movie ever made.
Should you see it? No.
Killer stalks teens at a summer camp - think you've seen it? Killer wears a hockey mask - wait, isn't that another film? Killer uses chainsaw - isn't that yet another film? This received some positive reviews and actually has two sequels (which I'm told are slightly better), but I don't get it. It's not a parody or an homage, it's not particularly bloody and there's little nudity (was there any? I don't recall) and there's nothing original about it, except the killer has the least threatening name ever: Trevor Moorehouse. I honestly think the people who say they like this actually saw the 1973 film of the same name. The title refers to a game that's played in the film, though the best line of the film suggests a better game and a better title: "Six degrees of mutilation." The chainsaw is supposed to replace his left hand, but the hand reappears regularly, the chainsaw changes size and it makes noise even when not running. The narrator's voice doesn't match that same character's voice in the film (hey, it even rips off "How I Met Your Mother!") and the plot has some problems. There's a ton of red herrings, which is nice, and the ending is actually a surprise and clever - but it's a long slog to get there.