I also feel Mencia is worst popular comedian out there right now. I enjoy irony/deadpan/thoughtful humor and Mencia is the antithesis of that. He always brags about how racist his jokes are, and even when he says something humorous he ruins it by yelling something along of the lines of "OH SNAP I SAID THAT ON TV DRR DRDRRRDRDDR."
Dane Cook I haven't paid much attention to since his Comedy Central Presents routine which was extremely funny. Everything else I have heard of him lacks since.
I will not comment on Larry the Cable Guy.
Demitri is the next best one-liner guy since Hedberg, and he does a great job making it his own.
"Someone asked me if I was ticklish. When someone asks you if you are ticklish, no matter how your reply, they are going to touch you. When someone asks you that, you should say something like: I have diarrhea.... and, yes... I am very ticklish"
2010 H2HWS Champion - Cleveland Clams