Mediocre
It saddens me that most of the animations were single-cell with minor eye/lip motion, or 10-cell loops. Other than that, most of the drawings were of poor quality, with no drawing skills or no connection at all to either Utada Hikaru, the song itself or Kingdom Hearts (Darth Vader? R2-D2? What the FUCK?).
Some of the drawings that at first looked like they had any future turned out to look like they were drawn over an existing picture, so just being a copy and thus lacking an artistic signature.
This doesn't look like a music video at all, and the only reason I gave 3 stars is because there seemed to be some effort in syncing the lips to the lyrics and the menus/credits were pretty nicely done. Also, the last animation before credits was beautiful.
I'm sorry but most of the artists need to improve their skills.