I thought the whole season was kinda crappy. Few good episodes here and there, but the main plot was just an uninteresting mess and that Lumen chick was just blah. The finale also sucked shit from a cup. With two girls, no less. There was no reason for Deb to NOT look at the killers and that whole bloodtest shenanigan was just plain tacky. So, what, Quinn and Dex are friends now? Fuck that. And what the hell was with the first episode, where Dexter just bashes the shit out of some redneck and it's never mentioned again? Third and fifth season are the worst this show has had to offer. THE WORST.
I'm guessing that Quinn will be the enemy in the next season. He'll turn into a killer or some shit so Dexter has an excuse to waste him.