I'm personally wondering how popular this show would be if 4chan didn't jump all over it and bring attention to it.
I'm just really confused how I didn't find out about the Penguins of Madagascar until almost a whole year after it debuted. I loved the penguins in the movies(and penguins in general, among other awesome animals) and yet I had no idea the show existed. I probably never would have if my dad hadn't accidentally DVR'd it. On the other hand, I heard of MLP less than two months after it debuted, and I had zero previous interest in ponies, magical or otherwise.
TLDR: The popularity of this show vs other cartoons due to 4chan, or the show itself? A question for the ages.