all black comedians like chris rock that started dedicating half their show to the topic of blacks and race simply lost the entire white audience, same goes with spanish comedians that their entire show was about "us Spanish people", and same with jewish comedians (jackie mason etc) that simply cant shut up about jewish jokes, im sure its funny for jews but not everyone is jewish or understands it.
The kings are always those who talk "general stuff" that the majority can understand and relate to.
Lewish Black content is funny but his angry presentation is annoying after 10 minutes, Jerry Seinfeld style presentation with Lewis Blacks content would be great.
Andrew dice clay was funny but after a few shows you can predict all his jokes, and part of a funny comedian is not being able to predict the punch lines (think the work of Larry David).
All said and done, you will have to look really hard to find a funny comedian in these days, comedy clubs in NYC are dying out, people youtube the names of those set to perform and they see the junk and dont show up.