Another vote for Dark Matter being good. It wasn't fantastic but it was good and was just getting really good when the final season ended. Huge shame SyFy ended it without giving it another chance.
Currently rewatching Deadwood again. Saw the Deadwood Movie last weekend and found it a satisfying but bittersweet finish to IMO the greatest TV show of all time. Also rewatching Babylon 5, a show IMO that's better than any one Star Trek series (I say this as a Star Trek fan). ALSO rewatching Battlestar Galactica for the first time since I watched it when it aired on TV. A simply incredible show, probably my number 2 of all time TV show. And I'm going through The Soprano's for the first time. It's very excellent, but I'm not sure I would peg it as the best show ever. Also just started S2 of Barry last night - good first episode. It'll take me all summer to finish all the shows I'm watching given my work schedule though, so though it may look like I'm a TV slob I'm definitely not.