First, even the movie is full of cliches and predictable the settings and action scenes are pretty well executed. Acting is just OK from the full cast.
Second, It could have been far better just with a more risky script. A lot of weird situations make the most part of the movie unbelievable.
Last, looks like the directors were inspired by movies like Con Air. Good point.
So, if you like non pretentious action movies, with non twisted script, this one is for you.