I originally found Homeland to be hard to pick up, but I'm glad I stuck with it, because it soon became one of my favorite shows.
Season 3's ending could've been a great series finale, which left me questions about how the show could go on. Season 4 may be a continuation of the show, but begins a new and intense chapter for the characters.
I would recommend this to anyone who enjoys true reality spy drama shows/movies. No over the top action, but still it manages to keep you on the edge of your seat.