I don't know who he is really I've only seen a few unfunny bits and pieces, but I saw a clip on Youtube with Joe Rogan talking about how much he HATES him because he disses his "culture" when in reality he's a white guy pretending to be Mexican or whatever. And then Bobby Lee comes along and says how he stole some of his material, and is like "wait ... is this gonna be on tv? Really I love Carlos Mencia!"
Can't find it anymore ... but but those are my 0.02 cents.