Too many characters thrown together in a haphazard plot, loads of mindless shootings & unnecessary blood spilt.
The ending was bad too. The twist at the very end was a little like, 'Oh, we gotta end this thing. What we have up to now so far is lots of violence, blood & gore. You know what? We owe the movie goers much more than this. Let's throw in a twist!' It was a random, out of the blue & pointless twist which just leave movie-goers very unsatisfied indeed.
& the MOST irritating thing ever, is that both of them took turns to be blind/deaf at some point of the movie, allowing his partner to re-enact loudly & unnecessarily.