I watched the first series of The Wire on strong painkillers after surgery. Had no idea what was going on, had to watch it all again.
The Wire = Best TV ever made (no space ships category)
Battlestar Galactica also = Best TV ever made (space ships category)
I have also enjoyed recently:
Spiral (French crime thing v graphic)
Prisoners of War (Israeli thing Homeland was based on but WAY WAY better)
Twin Peaks (although gets a bit silly towards the end, and even now 20 years after it came out, I'm still not sure I quite get it. But thats a good thing)
Game of Thrones
and on the recommendation of somebody on here am working my way through Tour of Duty again, the first series, before they let chicks be in it which ruined it. Takes me back to my teenage years when I couldn't decide if I was in love with Sergeant Anderson or Lieutenant Goldman, and settled on both. More for the (straight ladies) if you can get past all the shooting and references to "Charlie" which didn't mean cocaine, there are some great shower scenes.