What irks me is that none of the clues from the first five season were addressed. It's like none of that mattered at all. All of the seemingly important clues, mistakes, etc have any impact or importance on anything. They took something millions of people were covering closely and developing theories on and think it's enough to simply reveal and not explain.
Jane explains his tricks, what he knew, and the criminals' mistakes in virtually every non-red john episode, but decides not to explain any of this on the biggest mystery of the entire show?! I'm not upset with the character selected, but if you develop a 'smart' show for a 'smart' audience, don't act shocked when the show gets criticized for leaving almost everything people have been wondering about from prior seasons just dangling out there. You could probably explain "he is mar", Visualize, the farm, Rosalind Harker, and several other lingering questions in 1-2 episodes then move on and satisfy everyone, why not do this?
It's like if "Law and Order" just ended with the judge saying guilty each week rather than going through the court portion, there needs to be an explanation on motive, connections, etc.