Nice

I'm not going to say it's bad, but i've seen worse. Though since this is your first animation, i can't blame you. But if you're going to make another intro, how about adding some action, like having the heroes clash into Super Mecha Sonic (or Mettalix which some call it). That might add some excitement and also, even though I think it's fine, you should change the music and the way the characters are introduced at the start. That might help get views. But really, I think this is one of Top 20 best intros i've seen, and most people are lazy and don't bother making it look good. If you want ideas, you should look at Super Mario Bros Z or The Mushroom Hero series.

Kewl

Nice. For your first animation it seems quite good, and a good intro to the series. Everyones being a bit harsh, its a first animation and I bet you guys can't even animate so don't rate him bad since hes a newbie. The animation could be a bit smoother however it doesn't matter its just an intro.

could be worse

it doesnt really make any sense, also why did that Kai guy have Mickeys keyblade from kingdom hearts

You should feel proud.

Because this is the single greatest animation ever to grace Newgrounds.
Truly awe inspiring.

bad

I am sorry but i don't really think you gotta be proud of this... It was just a random sprite frames without any action and any point. Try to make at least a story, even with sprites the movie wont be that worthless. Anyway, I can't say its absolute zero, and for the first movie its okay. So keep doing, more effort net time!