The scarecrows had my approval of being threatening, malevolent beings. Their make- up/costume was pretty cool, I think. The back-story behind the scarecrows was interesting, though why only the nerdy characters could see the flashback, I don't know. Also, for the most part, the actors played their parts pretty well. One of the things I think that this movie does quite well is the avoidance of the normal cliché slasher-movie characters. There's no blonde-haired girl who's messing with three guys' affections or a shy, well-behaving female who survives the onslaught. This just has four males and one female, and they all get along with each other decently well.
I found this rather nice for a change. As aforementioned, I didn't care too much for how we found out about the origin of the scarecrows (via flashbacks that only one character could see), but I can try to look past that. Also, the chess analogy with such little evidence concerned me a bit, but it wasn't too big of a plot point, so I can deal with that also. Gore-wise, this had some pretty painful-looking deaths and injuries, but as I only saw an edited version, I don't know how much total bloodshed this had to offer.
Overall, I feel that this movie is something that a horror movie fan should be able to watch without grimacing. 7.5/10, rounded down to 7 to fit IMDb.