The Wire : best overall serie, the characters and the story really goes in-depth

Treme : amazing serie about New Orleans and it's cultural importance : jazz, mardi gras, food, community, how people try to get together after Katrina ruined the place

Black Mirror (UK) : short-serie, independant episodes, about our relation to technology and how we might interact with it giving new possibilities. Makes you think

True Detective : great serie, screenwriting, camerawork and amazing actors

Utopia (UK) : another great short-serie, about climate change, conspiracy theory, does the end justify the means ? Amazing soundtrack too

Breaking Bad : great serie over the span of 5 seasons.

Cosmos, A Spacetime Odyssey : about science, space, humans and our history

Deadwood : see bhrgunatha comment, I agree with him, it's an awesome serie

Louie : a sitcom from the comedian Louis C.K. It makes you think about different issues on life and is pretty funny.

Planet Earth : a documentary about our planet. Stunning images.

Firefly : a short amazing sci-fi serie

The Corner : a mini-serie (six episodes) which depicts the lives of drug addicts in Baltimore. From the same director of The Wire, it's based on a real story and is truly touching and humane.

Game of Thrones : great fantasy story.

Archer : a sitcom with animated characters. It's really funny.

House of Cards : great political story with amazing actors.

Luther : It's a mini-serie, you really feel for the main characters. It's a great short story

Sherlock : Also a mini-serie, great independant episodes.