She is obviously a talented, intelligent person. I think, at the risk of presuming to speak for others, that the negative reviews come from the fact that she is now basically a tool of the celebrity machine that's overrun so much of our world now.
There's creativity there, sure, but it's a soulless type -- too obviously a product of months or years of marketing professionals' meetings, focus group testing, and promotional demands. It's all about making somebody money -- greedy celebrities, greedier agents and even greedier conglomerates who own them both.
Very little gets revealed or learned with these images; rather, a marketing plan is set into action. That's not quite portrait photography as I know or prefer it.