If you havent seen season 5 and on...STOP READING
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Dexter should have pulled a Breaking Bad and announced their end date BEFORE THE STORY GETS OLD. They had the perfect storyline going, with Deb slowly coming to terms with the fact that this vigilante (Dexter) was doing the right thing. We all know Deb is going to catch Dexter near the end anyway, as everything has been leading to that ultimate internal struggle for Deb:
she loves ice truck....Dex kills him
she loves Anton....he gets skinned....Dex kills (jeff) skinner
she loves lundy....Dex kills his murderer (she thought Trinity killed Lundy)
Season finale last year should have been the point where she catches him, thus making this the last season.
Ugh.