This show turned out to be a nice little surprise! If you're not familiar with it, it's the story of two deep cover KGB officers in the USA during the Reagan era. I wrote about it here: The Americans
I've been enjoying it. It's no Justified, or Sons of Anarchy, but hey FX can't hit every show out of the park with a grand slam.
So far they haven't had the main characters do anything that takes them over the Moral Event Horizon: http://tvtropes.org/pmwiki/pmwiki.php/Main/MoralEventHorizon
Well, Elizabeth did murder the Russian's own contact last night, and the week before she killed a security guard. She's racking up quite a body count. How many does she have to kill?