I have a feeling that Bat-Mite knew exactly what he was doing from the get-go. He was shown in previous episodes to love BATB, even defending it to comic-con fanboys, but only acted like he didn't like it anymore because he knew it was the last episode. He wanted to take a not-so-subtle jab at the people complaining about it. That's why he was so calm and collected as he was disappearing into oblivion.
I'm sad that this show ended, but I love that at least the cteators knew it was coming, and prepared a very nice episode for all of us, where all the characters ended up realising they were in a 'Truman Show'-type universe all along, and then have all the villains, heroes and dead characters reunite in the once, top-secret batcave, awaiting their dispatch from existence. No longer enemies, all of them were now friends as they await their end. Its quite beautiful, actually.
Not like Spectacular Spiderman, which was building up to something great, and then have it cancelled on a cliffhanger.

ya, Bitemite is a fool, i hate him.
Cult Leader my mind's frightening, I drink blood from a human skull like a Viking

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I loved the Batmite ep - and a great way for the show to go out - written by the great Paul Dini no less. Good stuff. And yes, the show was too formulaic.