I know that there are a lot of Live Action Dramas or Movies that are really bad and most of the time your expectations get crushed by these. But not with this one. I have to say that this is an excellent Manga adaptation. The movie doesn't add anything to the story of the manga nor does it take out a whole lot of things that are important (As another reviewer already pointed out the movie covers the story of the first three manga volumes). It may have its faults in other areas like some CG scenes aren't as good as they could be and one or two action scenes seem a little awkward. But overall that're the only faults i can find in this movie.
The acting of the cast is quite good. Everyone was really good casted. But the one who shines here is Kubota Masataka as Kaneki Ken. Well I know that he is a great actor. I haven't watched a drama or movie yet where he disappointed me greatly. It's alway the other way around. His display of Kanekis emotions when he's struggling in a world where he doesn't really belong to nor wants to belong to is magnificent. He nailed this character. His acting sucks you right into the movie and holds onto you till the last minute. It's just great watching that.

I can only say to try it out. I had a lot of fun watching this.