I think Morrison was talking in very broad terms when he said that pre-52 Supes started to resemble a more right-wing figure (the establishment, the patriarch, the accepted "American" saviour). He was saying that crucial aspects of the character, like him actually being an alien and having to gain the trust and love of Americans, were increasingly getting marginalized because in many ways, he had already achieved the latter to such an extent that many (real-life) people forgot about the former element of the character and its deep implications.