The STORY of AIR Movie varies from the story of the actual anime, and personally, I prefer the anime. That being said, I didn't hate the movie - it just wasn't what I was expecting. I think I was just expecting a re-telling of the anime and felt let down; so go in with an open mind and realize this is drastically different from the anime and you'll probably end up enjoying it more. It's a bit more realistic, which I initially liked as well. And (spoiler) Yukito and Misuzu actually kiss, finally. I also rather liked the mythology aspect of it, and how it tied into the real world through Misuzu.
I didn't like the ANIMATION as much as I did in the series. It wasn't bad, per say, but I didn't like the rounded effect and the translucent effect around all of the characters. I understand that it is trying to create a dream-y atmosphere, but I found the anime to be even more compelling without that quality. I think I'm beginning to compare it to the anime, so let me see it as a separate entity. For me, the dream-y atmosphere it gives leads me to believe there is going to be a lot more of the supernatural than there is.
The SOUND was fine for me. I enjoyed all of the voice actors (I saw this in English dub) and I liked their work previously, so I knew I'd like it again. I also love all of the music. It is so soft and melodic and I found that to be very nice.
The CHARACTERS are gold for me. I loved Misuzu's dream-y personality and Yukito's sarcastic tones that always seemed to mix perfectly. I thought the supporting characters in this movie seemed to just be add-ons, however, and I wished there could have been more interaction and character development - although I did love watching Mizusu and Haruka's relationship grow.
My PERSONAL ENJOYMENT for this movie was quite high and I believe I've seen the movie more than a few times. I especially loved that she was very into the Mythology. I believe, however, that a lot of my like for AIR and the AIR movie comes from the fact that I see a lot of myself in Mizusu and Kano - so I may be biased.
OVERALL, I quite enjoyed this re-telling. I would recommend it to probably anyone, as long as they don't have a strong dislike for things being a bit too cheesy sometimes (which this movie had a tendency to do).