I was disappointed in the last episode and the last couple of seasons as well. The first few seasons were phenomenal in my opinion, but they drew it out far too long. Saxon story conclusion was terrible. I don't really see a way it could ever go down that smoothly, almost felt to me like the writers knew they had to tie up all the strings so they just did it in as little time as possible, and payed no mind to any last shred of plausibility.
I get that the Deb conclusion was supposed to be the summation of Dexter's emotional side, but to me, playing to Dexter's emotions was a bad move anyway, and felt extremely forced they way it was played out. Sure, he became a dad and all, but seeing all the things he did before Harrison, I think they went too far in building him up to be a machine early on to turn back on it and have him become soft. Especially considering how his emotional side cost him everything, i.e. not killing Saxon when he had the chance. The real Dexter would never do such a thing, he knows the risk in leaving anything in anyone else's hands. After all, how many times has he killed a suspect in a crime that Metro had all but locked up? He leaves nothing to chance until season 8, just seems too farfetched.
Maybe they can right the ship somewhat with a decent movie, but at this point it feels like they're just milking loyal viewers who have invested enough time already that there's no sense in stopping now, certainly the way I've felt for the last two seasons.