That’s a really harsh post-episode strip, so it may be better if I explain myself.
First of all, of course I don’t think the writers are as cynical as Twilight last line. That’s for the joke.
I really enjoyed this episode. In fact, I think I laughed at every joke. I thought all the characters were really well written, the song was cool and some parts of the lesson were good (you can’t please everyone).
What’s really bothering me is how every critic is magically explained by “it’s in-character”. No, it’s not. We had lots and lots of episodes of idiot balls and OOC. Not every episode has to be perfect and it’s okay to do mistakes, but to deny them is not. Especially when you end up with “Eyh, kids still like it and they are our true audience so it’s fine if we’re losing some grown-up fans”.