Well
-I think the biggest reason why this flash has so much negative feedback may be because you didn't really have the characters do much Power Ranger-esque things, which has always been the crux of the other three flashes, the parts that showed your talent. You were just getting started here. I know this is just the intro movie, and that the rest of the parody will be better.
-Otherwise, your animation has improved(I don't care that it looks a bit like Egoraptor's stuff, you made it your own), the recording quality has drastically increased(somthing that always bothered me about the other 3 flashes), and the actors are still just as hilarious, with props to Omahdon whose improved in the delivery of his lines.