Think nothing, I AM clever. The fact of the matter is, Sarah Silverman, though cute, really isn't particularly funny. Betty put it pretty succinctly, she doesn't tell jokes so much as try to push the envelope just for the sake of pushing it and manages to get by on that in the same manner that Carlos Mencia and Dave Chapelle do. None of them are particularly engaging, original or conventionally funny, they just get by on the "Oh no, you di'eeeeent" factor.
Everything Mencia does, Pablo Francisco does better; everything Chapelle does, Chris Rock does better and everything Silverman does, Janeane Garofalo does better. Fortunately for Mencia, Chapelle and Silverman, none of the three have the vaguest bit of artistic integrity and have no issue with doing this shit that's completely lacking in substance.