I love how they immediately killed off pretty much the only competent cop in Miamo Metro though. Then again, I didn't actually remember he was in the show, until he showed up shouting at people to get stuff done, so it's not too much of a loss.
I'm excited to see where the LaGuerta thing goes. I never really liked her, but she is pretty intelligent, basically a female Doakes. Right now there are basically three people that Dexter will have problems with. First off Debra of course. Loius knows something, but he's too curious to just reveal Dexter. And then of course LaGuerta, she's probably going to reopen Doakes' case on her own time.
Dunno about Louis though. I thought his role as some kind of mastermind in the previous season was sort of interesting, especially as a plot point that they developed over two seasons (they haven't done this since Doakes pretty much), but now he's cooling down and just turning into a nuisance I feel.
One part of the premiere I thought was really funny, sort of ham fisted, but ultimately necessary, was how Batista and Quinn just made up in the bar. Like, the conflict was just growing and growing, and then it just got solved in a minute or two in a bar. I like Quinn, even if he has the appearance of a guy you wouldn't really ever like. He's fairly intelligent, he doesn't bullshit too much, probably a better cop than Batista. I hope they don't kill him off in some meaningless plot armor bout (kind of like how competent cop guy got killed).