Mad Men is great, and is often considered on par with Breaking Bad, though I will warn you that the plot progresses extremely slowly at times.
Mad Men is absolutely excellent, but it has less a plot and more just a series of things occurring that propel the drama. Also the first few episodes can be positively glacial at times.
True Detective was so awesome. Watch it. Watch it now.
Justified is a great show too with some great acting and writing. It has a nice mix of action and dead-pan, black humor.
The Wire is one of the best shows ever made and totally should be watched by everyone.
Anybody here watching Showtime's Penny Dreadful?
I watched the pilot but I wasn't very impressed. Plus I don't have Showtime, so that makes it hard to watch.