Are you looking for newer series or any series recommendations? One that I think was underrated and overlooked was Galavant. I started watching it while stretching after workouts a couple years ago and fell in love with it. There are a bunch of good actors, fun and clever show tunes, and a pretty good story line. It only lasted two seasons, unfortunately.
We have been making our way through a number of series: The Wire, Breaking Bad, Firefly, Better off Ted, Babylon 5, Action, Arrested Development. Now we are alternating between 24 and Battlestar Galactica (reboot). If you would like any information or recommendations about any of the above, let me know. One or both of us had seen all of these series previously. We have a couple more on the agenda, probably ones you'd be familiar with and that at least one of us has seen (The Office, 30 Rock, West Wing, Psych, Once upon a Time, Lost). We also have Killjoys, which neither of us have seen but was recommended by a friend. We try not to watch series until they're finished one way or another. Others I have really liked that were pretty dark but surprisingly good were Sons of Anarchy, The Shield, and Peaky Blinders (which I haven't finished). I also didn't finish Unbreakable Kimmy Schmidt but thought that one was cute.