It's not funny if you're older then 12
The animation isn't too bad. I seen plenty of animations that are this quality and can be hilarious which can add a form of humor too it.
The entire atmosphere was very slow moving and boring. The jokes weren't funny at all and the voice acting wasn't that good either then again 90% of the voice acting on newgrounds isn't good at all.
Add music which will reduce how slow moving it is. The voice acting also made it seem very slow moving so try to work around that area with the people you ask to voice act in.
No offense, but the only reason I assume is it's this popular is, because of egorapter fanboys and possible having your animation to do with the Dark Knight.
It's good you don't take the bad comments to heart since 98% of the people on newgrounds are young children that have no sense of humor and jumps to anime/video games giving them high ratings, but you should take the constructive critiques too heart