Most recently, I went through all of Battlestar Gallactica (2004). Crazy show. I found it entertaining, but also annoyingly frustrating at times.
Sherlock is good, but goes quick.
Firefly is a favorite of mine. Western crossed with Sci/Fi with zombies. Only 1 season though. The only bad thing about the show is being pissed off with Fox for cancelling it.
I'm floating on documentaries until I choose my next poison. I've heard good things about "Lost Girl", but I may give "Arrested Development" a shot next.
FWIW, I feel like I'm one of the few that enjoyed Lost, but season 2 or 3 was weak. The ending of the series was disappointing, but I still liked the series overall.