It's flash over subtance...
But still very good nonetheless. I've never really been a fan of battles and duels unless they were unique and intelligent, and while this movie didn't present anything particularly original or innovative, it was still fun to watch. There's really no clear plot and the inclusion of the Chaos Emeralds and Knuckles' cameo almost seemed random. It was still very well done though, with smooth animation, great lighting and nice use of linear shading. The backgrounds were a bit lacking at times, but that's easily forgiveable, as the intense action was the main draw. It seems to take from Dragon Ball Z, but manages to be much more entertaining and fast paced. I especially like the heavy metal/speed metal music, which fit perfectly with the movie, although the transition from the first song to the second was too abrupt.