Nas, and even more so the Wu get little to no coverage over here, they seem to be overlooked. Even Jay-Z who is such a media whore isn't too popular over here. On the real though, anything on Aftermath or Shady Records is given a disgusting amount of coverage.
As for Craig David, I don't feel him, but he makes R'n'B, so I can't see why he gets hate. He doesn't pretend to be a gangster so he's just doing what he does best.
Roots Manuva is the main artist I like from the UK, everything else(Skinnyman, Klash) I just listen to once in a while.