Here is my brilliant commentary.
Deb got shot. She's fine. Oh wait, no. She had a stroke during surgery off camera. DUMB.
Dexter pulls out her tubes. She dies. DUMB.
Dexter CARRIES HER BODY RIGHT OUT THE HOSPITAL AND NO ONE NOTICES BECAUSE A HURRICANE IS COMING. SUPER SUPER DUMB.
Dexter leaves his child with a fugitive in Argentina with no warning. DUMB. (AND KIND OF A DICK MOVE. NOT COOL DEXTER).
Dexter going into exile to save everyone from him. After all season of them blathering on about how he's not a perfect psychopath because he LOVES Deb and Harrison and Hannah. WTF SO DUMB.
I mean, it also would have been dumb if he made it to Argentina. I really don't know what they could've done.
Here's an article with the producers explaining the finale. I still say DUMB. Especially in contrast with Breaking Bad which is just so fucking brilliant and perfect I can't stand it.
ETA: What about Aster and Cody???? Their half brother just disappeared forever. Well, they disappeared off the show too. It's all such lazy writing. UGH.