This is kinda tricky since a few of the shows are only halfway through it's season with others being almost forgotten since they aired their last episode awhile back. My list reflects what I'm actually watching so there will be no Game Of Thrones, Breaking Bad or Dexter. But here is mine in order.
1. Person Of Interest
2. American Horror Story
3, Parenthood
4. Sons Of Anarchy
5. Revenge
6. Nikita
7. The Walking Dead
8. Friday Night Lights
9. Parks and Recreation
10. Justified
There were a host of other series that deserve to be on the list, but because of when I started watching it or have yet to finish watching them, they are relegated to Honorable Mention status: Misfits, Homeland, Fringe, Archer, Ringer, Leverage and Hawaii Five-0. The last two editions of Survivor also get honorable mention as well since they both aired in 2011.