Most of the acting simply didn't matter. Who really cares with such a hollowed-out shell of a non-existent story?
The editing was sometimes thoroughly incomprehensible. Too many connecting bits were cut for time, leaving us with extra gratuitous special effects to fill the void.
I do salute the animators for their wonderful animation. I do salute those cool ideas that did make it into the film. Really, I just about salute everyone. It's not their fault that they got handed a steaming pile of script.