This series is well worth watching, though people should remember that it's based on a non-US TV series (from Israel), just like House of Cards is based on the superior 1990 UK version.
Not believable at all really, and both leads are irritating actors, but the writing saves it.
Avoid Homeland series 2 though - it's a shame they couldn't leave it here, instead of milking it. And Clare Danes a supposed CIA whizzkid is always so dizzy and incompetent she looks like she wouldn't be able to run a cookie stall at Charing Cross station, and yet here constantly seems to be an intelligence genius - there is real comedy in this series if you know where to look!
I was very surprised by Homeland, it wasn't quite what I expected. I expected something with a faster pace and highly plot driven. In fact the pace was slow and deliberate, allowing time to develop the characters. In the end it became something far more enjoyable and rewarding.