If i were an optimist, i would look in these things for a slightest little hope:

- how Red John knew who will be in Patrick's shortlist EVEN BEFORE Patrick? We never got the real answer. Season 5 ended with that bang and as much as I wanted to know who is Red John, i also wanted to know how he knew those names. That thing is still huge!

- the mysterious USB flash drive containing what? All we know it was found in Gale Bertram's secret room (but we saw that lady addressed him as Thomas, why?) and if you look better that scene, I don't even think Gale was aware of that flash drive. However, even though flash drive is somehow connected to Red John, we've already seen Patrick using it to get his terms with Abbot so I kinda doubt they will ever revisit that flash drive, don't know..

- and final thing - last Red John words: ''I have real psychic powers''. That was the biggest anti-climax moment for me. This is not a sci-fi show and if you watched the show from beginning, Patrick said numerous times ''There's no such thing as real psych'' and we all know it! And not to mention, Red John actually killed his wife and daughter just because he was pretending to be psych and badmouthed him on TV. That last sentence from Red John doesn't add up to the whole show, no way.

BUT, on the other hand, the fact we never really got to know how Stiles knew where was Kristina Frye kept, and they let him die without ever telling us, makes me believe it is over and kills my any hope i will get any other answer, they just don't care. I mean that thing was huge back then. in any normal tv show that would come to line to be answered at some point.