People just like to judge stuff like that with today's standards, when concepts like marital rape are very very recent and would not appear at all in a world like that.
All the war, gore, burnings, violence is fine, but get some sexual stuff and lights start to flash.
Also, how are they going to justify her being married to Tyrion AND Ramsay? The first marriage wasn't annulled (even though it could be, as it was not consumate).