Feels like a wasted opportunity
If you discard boring side storylines and a bunch of unsympathetic characters, the original Dexter had kind of a Pinocchio feel: it was a story of a psychopath who learned how to be a real human.
And no matter how many issues I might have with later seasons it was still an amazing journey with an incredible finale: Dexter made a decision to leave based on the principals he discovered for himself and his own hard-won understanding of right and wrong.
And then he what? Just snaps and goes back to killing? I think this new Dexter deserved some truly extreme circumstances forcing him to let the Dark Passenger off the leash. Not a dead buck and a rich asshole...