It HAD prospect for success
I wanted to like the film. What I liked was the beginning of the story and the Titans were very creepy. But it was like they made it in purpose to be different from the anime. I haven't read the manga but I did watch the anime. I don't know which one (the movie or the anime) was more reliable on the manga, but the film is a failure. The story and the characters were almost completely different from the anime. The personality of the characters and their beliefs or driving forces were briefly explained by the film. The editing was bad too. The visual effects around titans were convincing but around the ODMG equipment were not.
Conclusively, the film was disappointing except from the horror touch of the titans (and the creepy sounds they were making!). If the filmmakers were just rely on the anime (maybe on magna too) then it could be considered as a great modern horror movie!
Watch my list on Youtube: https://www.youtube.com/watch?v=7FxGeULixWk