She also didn't object or fight: zero indication it was rape. It's possible to be consenting and not like doing it...
That said arranged marriages are all rape because they are coercive.
I dunno, he made it seem like he was either going to beat her ass and screw her or just screw her. I would have preferred they just cut away to the next morning and just show her crying or something. The problem I have with this scene is it just seems creepy for the sake of being f'd up. Also something not right about the implication the step brother's pain at that moment is worse than Sansas.
There is no justice in the show, so its just yet another crappy thing happening to a decent character. I dont think there will ever be a payoff that justifies all the evil deeds in the show. There were only really two scenes in the series so far that made me think I might stop watching the show: Sansa's wedding night and Oberyn's death. It may be that I just wait till the seasons are finished before I watch so there isnt any one thing to focus on for too long.