Maybe it's because I have watched the first season of the anime only and not the second that I;ve found the second movie slightly better than the first.

For an anime adaption, their special effects were surprisingly good. Even the giant octapus of a teacher\allien was real like enough. Other than that, the story gave an insight to the character's past and it was nice to watch why everything happened. Other than that the movie kept the familiar pattern from the previous one and didn't help the characters develop a better relationship between them so their decisions could be justified. Nor did it provide a more in depth presentation of the students.

So, six and a half out of ten.