I thought this movie would be necessary to bring closure to the Blood-C series. In the end though it really wasn't.
Saya goes through all these hoops only to basically be told the same thing at the end of the anime.
It was frustrating and slow, but it looked a lot cleaner than the already clean series in terms of animation.
Basically this movie will just reinforce the ending of Blood-C and say that nothing good will ever happen to this character ever, and it won't even answer any of the questions it raised through the series and the beginning of the movie.