I liked it but...
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.
Yes, this was a bit disappointing, but I think that's already been established. However, I enjoyed for what it is: a modest intro. A bit more modest than most of us would have liked, but hey, what can you do.