Yeah I agree, whilst it was a great performance by colin Morgan I did keep waiting for Arthur to go... "Merlin, are you crying?" I guess it was dark, and they had a flickering fire between them.
Still seems a bit unfair of the Dsir to judge Arthur, given how much fairer things are under him, and whilst sorcery is still outlawed, Camelot is moving towards a notion of tolerance for other beliefs at least. Rather than giving him time, perhaps nudging him along, instead they decide to go on an all out attack, which is just as likely to drive Arthur back towards what Uther was like.
Stoopid old religion'ers!