1) The Newsroom
I hate that Aaron Sorkin let his ego go out of control and this only went three seasons. (The rumor is he walked away because it was not getting the same ratings/recognition his previous shows got on HBO) It's an excellent fast paced show about life in the newsroom at a major TV station. The characters were right, the dialogue smart, I loved all of it.
2) Rescue Me
Denis Leary and his crew made me fall in love with these fire fighters we followed in post 9/11 New York City. Sure, this show had its issues. Most of the female characters were awful and they were under huge scrutiny for the way they handled serious topics at times, but overall, I really liked this series. It was the first time I ever cried watching a TV show.
3) Breaking Bad
The gold standard of TV in my opinion. Walt and Jesse's various meth labs were their work place. I can't recommend this show enough. It's absolutely incredible. Every single moment of it.