First the good. There's plenty of action in the film and the fight scenes are pretty well choreographed. Not on par with anything from let's say "Drunken Master, or Once Upon a Time In China", but still much better a similar movie 'American Ninja'. The story is believable and I wasn't bothered by any potholes. I saw another person post something about the main character being white as absurd. Well this is fictional movie so...
Now the bad. My main issue with the movie is that I was expecting something more Ninja-esque. The title still makes sense once the movie is finished, but 15% of the film gives us a true ninja feeling, and the rest is more of a vigilante film.
Verdict. A good movie if you love martial art films. If you expect something similar to a recent big budget film like 'Ninja Assassins' this is a far cry from that, but check it out for yourself.