Lets get the bad out the way first. The plot is as old as the hills and for everything to fall into place the characters have to make some shockingly bad life choices. The budget is not massive and sometimes its shows.
But saying that i really enjoyed this film. The acting is very solid, the antagonist is very believable. The rest of the cast deliver sterling performances and despite zero nudity the female cast are as sexy as hell.
The real star of the show though is the camera work. The majority of the shooting is stylish, well lit and well composed. Even the obligatory spinning of the bottle has a certain beauty about it.
The violence is brutal without being sickening (no one goes all 'Hostel') and there are numerous tense moments. The soundtrack is pretty good as are sets and locations.
The plot starts to unravel near the end (like 90% of horrors) but keeps it together enough not to spoil it.
A very slick and professional film considering the budget.