Having read the original Dan Barry novel, which is superb and highly recommended, I had high hopes for this, considering an excellent cast and director. Although I enjoyed the film, I was left feeling it could have been better. Parts of the book are left out,good ones at that, which seems a little strange when the running time is just about 1 hour 20 mins. Extra time could have been used to flesh out the characters, who to be honest, are pretty much blank canvases to hang plot points on.
Having said that, its an enjoyable, turn your brain off film, that has kept the spirit of Dan Barry's book, if not the heart and soul. Nice turns from most of the cast. Final verdict - rent, don't buy.