Just finished the finale last night. I feel cheated, but relieved at the same time. The last few seasons had become tiresome.
SPOILER.......
I've tried to imagine a better ending, one that doesn't just throw away all the investment of 8 years. I would have liked to have seen Deb pull through and perhaps join Dex and Harrison in a new life, removed from his "passenger." I have mixed feelings on Hannah, but it would be tough to remove her given Dexter's (apparently) real love for her. Honestly, I never fully bought in to that relationship. Rita, though.... Wow.
Anyway, fun show, I'd still recommend it, but I might caution that it's downhill towards the end.