The mediaevalish background reeks so much I can't watch the series. Also, people being mean isn't so entertaining, if you don't identify with the villains at least. So it's not that minority an opinion even here.
And although the series has a fairly high viewership for premium cable, I don't think it even gets a majority of HBO subscribers. It certainly doesn't seem to have inspired a lemming-like rush to buy HBO amongst the millions. In the whole context, Game of Thrones is still a minority taste.