If you acknowledge Iggy as "Pop Rap", then I think she's relatively harmless. She's the equivalent of a boy band. Clearly there's some talent, but it's kind of an empty shell and rather soul-less. But that's pretty much the definition of 90% of pop music and the majority of mainstream rap these days.
Her mistake is that she wants to be taken seriously as an authentic hip-hop artist and she's having a public tantrum because she feels she isn't getting that kind of respect. Since she's making an issue and complaining about the haters, people are pointing out her inauthentic rap accent and limited urban life experience. She would be better off keeping a low profile, honing her craft, and continue to build up allies in the hiphop world in the studio instead of having feuds with them over twitter.
Gotta admit though, if her booty really is real....dayum! However, eventually gravity will take its toll on a booty like that, so if she wants to have any kind of longevity, she's going to have to start creating music from a more substantive place.