Just not that funny.
I quite like the webcomic and have found quite a few really funny. This animation however, along with the last one, just weren't that funny to me.
I think it's a combination of the below average voice acting and poor jokes. The actual animation on the other hand is pretty good, and a perfect follow-on from the webcomic.
Really not trying to be a douche here as you're getting good ratings, I'm just not sure what I'm missing.