Lack of good storyline.

If you're interested in the topic at hand, you should just watch it and judge yourself because the reviews have gone very biased by people that didn't even watch it and just hate (or love) the creator. I liked it, it was well written, narrated, and directed and it was about a topic that interests me.

It is neither dumb nor smart enough to be fun, and spends way too much time with its boring human characters.

The storyline feels a little thin and moth-eaten in parts but this sequel is plenty of fun.