surprised nobody has said House Of Lies, on showtime. It's starring Don Cheadle, Kristin Bell and Ben Schwartz. I think it's pretty bad ass, it has 2 seasons out so far. But this is Slap, so I feel you guys might not like a show about the 1%.
Also agree with Breaking Bad, Curb, Always Sunny, I think The Burn with Jeff Ross is worth checking out too.
Another show I really like is The Newsroom. I'm not huge on politics but I think it's pretty compelling stuff. Jeff Daniels is amazing in the show. Here's a clip of the first 8 minutes of the pilot episode.. I'm sure some of you may have seen this already.. really awesome shit
THEN another show that is coming to HBO that looks absolutely hilarious is called "Hello Ladies" I think everyone should check that one out coming soon..