After watching 2 seasons of the anime adaptation, I thought this would not make it justice. It is not as good as the anime, but they managed to fit the main story in 2 hours. Not as deep, and not as humorous, but it is a decent adaptation.
Obvioulsy, you can better develop all the characters in 2 seasons of a series, add side stories, come up with more adventures, add little details that have to be discarded in a movie for the sake of running time.
All things considered, it is a good movie.
My advice, watch the 2 seasons of the anime, You'll be wanting more at the end. Trust me. Then, you can watch this live action for a little bit more.