I don't understand what all the fuss is about. Everything is self-explanatory:

Bruno Heller had no fucking idea who Red John was and why and how Red John did everything he did. Simple.

Yeap the episode sucked big time and fans were duped by the idiot, Heller. Because yes it's idiotic to make a series with an archenemy that has made Patrick Jane who he is, and have no backstory to this whatsoever. Even more idiotic were Heller's comments on how the story would unfold and everything would fall into pieces without any polar bears missing explanation. Indeed we had killer pigeons, stupid twin theories and tyger tyger poems instead of polar bears. Seems the same shit to me.

And i certainly don't find amusing what Heller said about the backstory having no excitement but would make for good internet fodder for fans. Fans didn't watch 'Red John' to have exciting fun with the FBI's silly chase, fans wanted closure for a story which began from episode 1. And got ABSOLUTELY nothing.