I watched this being familiar with the manga and anime but hardly a die hard fan so the story changes didn't bother me. The basic story-line stayed the same in the movie- humans trapped inside walls, titans attack, humans try and fight back- but deviated and shrank the story down to basically action scenes. Other than a brief intro period the movie consists of fighting, dying and gore. That to me is the movie's weakness. The emphasis on action combined with a shorter running time really hurt character development. Without building the connection between Eren, Armin, and Mikasa, there was little to root for and left me feeling disconnected from them because the plot didn't build the personal relationship well. No complaints about the acting really. All the actors did well at portraying fear and desperation throughout the movie. My shallow side also appreciated how good both Miura Haruma and the Levi stand in Hasegawa Hiroki looked in the film. The background music drove me crazy! It was to loud in quiet scenes and never seemed to fit with the action on screen. Very distracting overall and detracted from my enjoyment of the movie. This might be partially because of the source but still very annoying. I might rewatch in the future but only because the source I used was very grainy so I wouldn't mind a better quality source. If you are looking for a faithful adaptation of Attack on Titan don't bother. If you want to see a fast paced kind of gory action movie this might be for you.