Question to American Game of Thrones fans

[Hellspell]

Game of Thrones despite being an American produced show is a one that has a rather British feel to it. Despite this the show is very popular in America and around the world. I would have thought that the abundance of different British accents would prove a detraction to American viewers but perhaps it is not. So my question to you would be do you understand the accents entirely and would you have them replaced with American ones?