Too many close ups, and from weird angles.
I hope that is what the director wanted, but it was distracting.
Most of the aliens were real jerks. Thank goodness Ultraman was on our side!
It was polished in some areas and very unpolished in others. A nice, cg, shiny Ultraman for fights, the 2D guy, very neat! But then they used that looking down shot of him (EDIT Ultraman, that is) flying up over and over, it looked like a paper cut out.
I remember hearing long ago that when the US tested the first atomic bomb above ground, that the physicist who was supposed to make sure it wouldn't ignite the atmosphere screwed up his math. A trillion degree bomb would probably do the trick.