Well, I thought it was fun. Good on 'em.
Should you consider all films equally regardless of budget or production methods? Open to opinion, but I think it suffered slightly playing right after the MUCH bigger budget Eden Lake.
If it was sandwiched between Trailer Park and Bubba's Chilli, it would've played better.
Pacing in the middle slowed it down (they should think about doing a few tweaks), but I enjoyed the shower scene, deaths and weapons