Blah and blah and blah.
I can't say much that other reviewers haven't already hit upon very accurately. Except, that this flash could be very cool....if it were complete fantasy. 1 Because it is not realistic in the first place. 2 Because the 9/11 attack is nothing I, or most people, really want to 'make fun of'. You're making fun of it because you're turning it into entertainment...and, I feel, without any respect at all.
I'm sure there are millions of people shedding tears for terrorism. But again, entertainment in the form of colorful 2 minute cartoons to a track of completely unrelated music is not what people are looking for in their tremendous GRIEF.