I'll keep this review short and sweet as MAL will let me.
Story was unnecessarily convoluted and not really explained well; if you take the time to understand it, it's not worth the effort. Nobody's motivations really make sense and the conspiracy they hype up, as well as the resolution to it, are honestly laughable. Like you're either going to cringe or laugh; it's that dumb.
The characters are flat as hell in this movie, especially Mika, who they decided to essentially completely rewrite because she sucked so much in S2. The result is you have a character that acts completely different despite having no development to do so.
So basically: story sucks, characters suck, art looked great as always, sound was good. Overall, movie sucked. Watch something else.