Season 3 is a great season, much better than 2. In fact I find Rudy a much better character than Nathan. Joe Gilgun is doubtless a better actor in my mind, and Rudy is just more interesting, funnier and a more likeable and empathetic character, who can also shock you with his dick-ness. Season 4 was meh, but Season 5 was more or less flawless.
Also, there are four GoT actors in Perrier's Bounty, as well as Cillian Murphy, Jim Bradbent and Brendan Gleeson if no one said that.