Bates Motel is really interesting. Buffy's amazing as well. Young Justice got canceled recently and it's a good superhero series. And American Horror Story is so entertaining.
Breaking Bad
Games of Thrones
The Walking Dead
Burn Notice
Community
Parks & Recreation
The Office
Big Bang Theory
How I Met Your Mother
Arrested Development
The Inbetweenrs (UK version)
Skins (UK version)
Depends on what you feel like watching. If you haven't seen Homeland (Psychological Thriller) or The Walking Dead(Horror,Suspense) you have to watch them. Some other good options are Battlestar Galatica (my favorite tv probably ever), Seinfeld (great sitcom), Get Smart (really funny), Smash (Musical/Comedy/Drama, like Glee but a lot better), Supernatural, and Grimm (Both really horror/mystery shows).
The Walking Dead
Man Men
Breaking Bad
Dexter
Weeds
Modern Family
The Vampire Diaries
True Blood
Damages (i know, still good)
30 Rock
Parks and Recreation
so many more.....
Pretty Little Liars is a great show! I wasn't hooked after the first episode, but after seeing a few episodes I was maybe 5 episodes into season 1, I became addicted.
Also, Grey's Anatomy, Scandal, Revenge, Desperate Housewives, and The Walking Dead are good.
But that's more a guilty pleasure. 
