Mitch Hedberg was probably my favorite comedian of all time. His awkward, monotone, and nervous delivery of his material always made me laugh at the joke, even if it wouldn't have been that funny if it had been told by someone else.
Robin Williams has been hit and miss for me. Some things I have seen have been amazing, and other shows I have seen haven't made me laugh at all.
I bought some of Rodney Carrington's CDs a long time ago, and got a lot of enjoyment out of them. Haven't heard any recent stuff, and thought his tv show sucked.
I really liked the first Caliendo performance I ever saw, but after seeing that his schtick and material hasn't changed in years, I am starting to strongly dislike him.
Dave Chappelle's stand up is great. I absolutely love his "For What Its Worth" special. For some reason I never really liked his show, other than a few of the more popular skits.
Mencia is horrible now. I first heard him when he would come on a radio show I listen to, and he would ad-lib things and it was hilarious to me. Then when I saw some of his stand up and his tv show, I found him horrendously unfunny.
I really don't like Pablo Francisco. In the stuff I have seen he jumps around sporadically with his different voices, yet fails to ever make a decent joke, or much sense for that matter.