hendersonhank
Member
All of the things you listed further the plot and/or give us insight into the characters that these things happen to or those that committed them. Unless things go wildly differently then everyone is suspecting, this rape is probably going to just be another item on the already amply long "Ramsey is horrible" list and won't alter the trajectory that Sansa was already on. I could be surprised and the way Sansa reacts to this could be well written, but I'm not holding my breath.
Consummating the marriage is a step on the path to getting what she wants, or at least that's what Littlefinger convinced her of. She had to marry Ramsay as part of the plan and marriage requires consummation.
What other way is there for her to aquire power other than marriage? Dany got power by marrying Drogo and even now is marrying Hizdar to consolidate it, and she has the luxury of having the only dragons in the world. Cersei got power through her marriage to Robert. Margaery got power through engagements/marriages to Renly, Joffrey, now Tommen.
Sorry, that's how it works in medieval settings. That doesn't make it "bad writing" because you wish a woman could have something nice happen to them for once.