Reviews should never be based on score, it's the words inside that count. And a lot of people just don't give honest reviews. This isn't fucking Youtube comments, this is Newgrounds reviews. Professional? No. But comments and reviews don't mix.
Humor was bland, timing so very off and everything just far too enforced. At some point can one say that "Yeah, anything can be obvious", but how blatantly obvious this toon was made me somewhat sick with a headache. Insert "batman's voice" joke here. Insert "Bane is dumb" here. Et cetera, et cetera. Too old, nothing new. Well actually, Bane being dumb doesn't make sense because he is remarkably intelligent, sure he isn't just killing Batman, but then there would be no movie would there. Another issue is you attempted to create "humor" by using funny faces, wacky voices, and other gimmicky bs. Try finding some interesting material. Those faces were too plain to be funny with the spastic movement and the general commentary towards the stadium singing is something I think is overused and just not funny.
Aside from that the animation is definitely could use work and the audio had nothing remarkable about it. Now the visuals and audio isn't really expected to be high quality, but the repetitive background and rather lack of interest in the scenes just lowered the quality. I'd suggest putting in more things to look at that add some color to Gotham's otherwise colorless outlook that you put on.
Now I'm obviously not giving this an absolute zero and for good reasons. The flash worked. It functioned, the tone was understandable, and of course the message you were conveying made sense. From what I've seen from trailers this is exactly what course I fear the movie would take on itself. I love these new Batman movies, but there are a few plot technicalities in them that make me want to shoot myself and I'm suspecting this one will have loads.
So good job connecting with the audience, but I'm feeling that your attempts at humor were just too forced and without laughs.