restricting it to ten is quite a challenge... in no particular order:
breaking bad
press gang
deadwood
the wire
frasier
modern family
true detective
game of thrones
misfits
blackadder (4, 2, 3, 1)
that's based on stuff that has stood the test of time, and newer stuff that really had an impact on me. honourable mentions to the sopranos (other than the duff season), mad men (ditto), the IT crowd, father ted, the trip and justified.