I dunno, I liked it. ^^'
I don't watch thrillers/suspense/whatever-you-call-them movies very much, so I don't have much to compare it to, but I enjoyed the movie. Probably wouldn't buy it, but I thought it was worth seeing once.
SPOILER (since it's kind of hard to talk about the movie without spoiling anything at all):
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I kind of wish they would have died when they decided to leave the house to be together. I may be a sucker for tragedy, but I think I would've liked it better than the happy/cheesy kind of ending that actually happened.