Just saw it with a friend and we both liked it.
Despite the predictable changes to the story to better fit the 122-minutes limit it was still very true to the original mangas (which i later dug up and reread). Every one who read them will recognise the various scenes even with the changes. And they set it up beautifully for a second (and third) movie. Quite a lot of potential.
I'd give it 8/10 for just the movie itself.
If i were a stickler for 'but they deviated from the mangas' i'd have to lower that to a 6/10, but i won't do that. Movies are movies.