In a good way.
Because of the tension and the claustrophobia and the psychological yickiness.
BASICALLY, I REALLY LIKED IT.
(Note: the cover art on the ARC is totally, totally different, but I can't find a decent image of it. Oh. Here. See? Way different. I think that the art on the ARC echoes the actual book more closely, but I understand why it was changed, I guess. Ish.)