For starters, the movie gets absolutely everything wrong about events of the Bosnian war, but since such ignorance is expected from Hollywood, there is no reason to hold it against this particular title.
The premise of the movie is good, the basic story is decent, but the script could have been better written, the two main characters' stories never get satisfyingly developed. If this was directed by John McTiernan as originally planned, this would have been a great movie. Sadly, instead we got the guy who did Daredevil and he once again delivered a bland, uninspiring product. Acting is OK, Travolta did his best to hold a consistent accent (it was the wrong accent, but hey!) throughout the movie, while DeNiro looked more like he was only concerned with the paycheck.
All in all, the movie is not terrible, I guess it wouldn't kill you to watch it if you have nothing better to do for an hour and a half. The sad part is that this could have been a much, much better movie, perhaps even a classic.
