Comparing it to Reek is pretty uneven, considering a huge part of Reek/Theon's arc comes directly from his torture and disfiguring.
Adding brutality "just because" is sloppy and, at worst, irresponsible. It's not an effective way to tell a story, especially when we have had 4+ seasons that SHOW us how brutal the world is. It's tiring.
It's especially tiring because we, as viewers, have NO reason to expect that Sansa's rape (or sexual abuse or whatever you want to call it) will lead to any meaningful development or character growth. Cersei certainly didn't, but that's partly because the directors/producers (or whomever) didn't think it was rape. Since it sounds like the same is going to happen here, it'll just be "another day in Westeros!" At this point, Sansa has almost been through it all except sexual abuse, so it feels like a cheap "checkbox" kind of scene that likely won't add much to her character or her story.
Like I said, there are plenty of opportunities to show Ramsey's animal side without resorting to sexual trauma on a character whose entire existence for the past few years have been defined by trauma.
