On one hand, it's always good to see young people enjoying themselves, and I'm all for anything that reminds people of hip-hop's origins as party music.
On the other, the only real issue I have is the same one I had with "trip-hop" - above and beyond the usual dilettantes and cultural tourists that always tend to congregate around this sort of thing, there's a certain section of the audience that feels much more comfortable with it when the more idiomatically "black" elements (i.e., the rappers) are either de-emphasised or shunted out of the picture altogether.