I saw my first Dexter season this week. Season 2.
It's like a post-9pm version of The Mentalist. Really, it's almost exactly the same as The Mentalist but the protagonist is a serial killer instead of a hard-to-understand genius. The background characters, the look of the police station, the light whimsy, even the general dialogue, it was like they shared scripts and just switched the main protagonist.
It was enjoyable to watch, it kept me entertained, I didn't hesitate to put the next disc in, but I'm not sure I'll watch any more series, feels like over-worn territory.