I don't think anyone is asking him to write rape scenes, but the POV should at least demonstrate why the character's worldview is warped.

I think RJ's challenge would be to make the villains charming and intelligent characters whose worldviews and thought patterns aren't so obviously gross. An intelligent person who has reasons for destroying other people and the world without dipping into insanity or barbarism is more terrifying than a mindless monster.

In other words, he shouldn't take the easy way out and just tell us what they did to make them Forsaken - he can subtly nod to these horrific activities. It is this ability to engage the imaginations of readers to fill in the blanks that I find RJ lacks. For example, if all the inhabitants of the farm Lanfear visited were found to have gone insane and eaten each other, and we found this out from the POV of an Aes Sedai sent to investigate, it would reinforce what Lanfear did during the Age of Legends in our minds while making a trail of horror that would magnify her threat. Her threat wasn't that she was an amazingly powerful channeler - it was that she could drive entire cities insane. But we never see this - all we saw is her skin one man, kill a girl, and throw waves of Fire at Aiel. In other words, she is operatic and larger than life, but not horrific in a human sense.