Oh gosh Dexter was amazing. I hated the ending, and I hope Michael C. Hall comes back for more stuff with Dexter, but it was an amazing series overall. I also loved Breaking Bad, that was a good show.
I can't rate any of mine because I love them all, but mine are Dexter, Breaking Bad, Sons of Anarchy, The Walking Dead, and American Horror Story. I have more but those are my absolute favorites.
Avy & Sig credits go to Hurricane0