Originally Posted by fiorentini

But South Park is an ongoing series. The question is for series that have already finished airing, and you watched in full.

well, apparently 19 seasons of south park isn't enough, but whatever.
then my answer is breaking bad.
one of the best tv series ever. really loved almost everything, but i think they stretched it too much at one point. 9/10

The 4400, im not sure that i could do it if i start it now, after plenty of good series

The first one was Lost, but not the best show I've seen so far.

Fringe (2008 - 2013).

Would really like to be cool, but the truth is that it was probably The Little House on the Praire (1974-1983)...

for me its How i met your mother (2005-2014)

I think Smallville, but always looked on TV, so maybe I've lost some episodes.
The first one that for sure I watched completely was Lost.

Mine was Lost, It's one of the series with the longest seasons but I have to say I loved it, specially the time travel action

Smallville of course, the best super hero tvshow ever.

That has to be Dead Like Me.