It's a fun show from a writer from The West Wing, but it's pretty political-soapy and can be over the top. The cast is fantastic (Keri Russell is the lead), Allison Janey joins in S2, Bradley Whitford in S3). Looking forward to Season 4. Ali Ahn as Eidra Park, a CIA agent, is my fave character.
It's not The Americans though, and it took me a while to get into it for that reason (because I needed another The Americans, or at least a reason for Keri Russell to don a really bad wig...) She plays the new ambassador to the UK the same day a UK ship is attacked and has to deal with lots of political drama.