After watching couples of the movie's prequels, i would say that this movie is a lot more logical made.
Though it's quite slow in my opinion, it's still worth a watch if you like Suspense Drama.
The movie continues those previous movies with additional rules, which make the story more unpredictable and complicated. That's one of the good point of this movie, having more roles make the movies more interesting.

Good points: New roles, unexpected ending, better story, better scenes than previous prequels. Acting is decent enough.
Minus points: Music is somewhat terrible, and story being told quite slow. It could have been done a lot better than this.
However, i'm a huge fan of good story rather than music, i would rate this an 8.