I've read that a lot of GoT fans are actually surprised it won. I don't watch GoT, but IMO The Americans absolutely should have won. This last season was absolutely brilliant.
It's also a travesty that Keri Russell never won for her work on that show. IMO this last season was her best, but she has been amazing throughout the entire run. If I had to pick between her and Matthew Rhys to win an award, I'd pick Matthew, who was a bit stronger throughout the series as a whole, and the parking garage scene the used in his clip was just absolutely heartbreaking to watch (the series finale as a whole, actually...)