I enjoyed it. I think it would have been more fun on the big screen, but I did get to see it for free at the local university.
The characters were a bit shallow and I couldn't relate to anyone in the film, but the actual suspense and horror part was well done. It was like Blair Witch Project done right. I'm a big fan of building suspense and "less is more." The fact we only really ever saw glimpses of the creatures until the very end was fantastic. And the little thingies were creepier than the big one.
So yeah. Enjoyable action/suspense/horro flick, even if the characters weren't memorable.