Personally I don't even get the controversy. She came up on on "urban" music, dates rappers, have her albums produced by "urban people", came out with her singles featuring rappers and it being produced by babyface and gives props to all the urban legends as being her inspiration.
At the end of the day "pandering to the urban market" means "pandering to the everyone", it's not the "urban market" that makes rap and R&B the biggest genre in the world today. People make black music to sell to the masses not to sell to black people. As long as you don't try to talk like you're black, when you never had that accent to begin with and shyt like that, that's another level. But even in some cases like Paul Wall if you really came up with black people, married to a black person, chances are high that you'll be affected by black people in terms of accent, way of dressing or whatever the fukk.