And once you meet him IRL you realise that he's actually a GOOD actor. Because he's nothing like Ronon.

Or rather, he's nothing like Ronon when he's with the Atlantis team. He is pretty darn close to what we see him do when he meets other Satedans (well, the drinking and eccentric fun side of him, not the "you're not Satedan" stuff where he blows heads off)