Dane Cook pretty much sucks. Anyone who opens his act with "what's up (town name here)" is guaranteed to put on a painful show. There's going to be a lot of, "dude, I was at this party blah blah blah." How many millions of comedians do that crap? It's like the "hey look I can say fuck" comedians, the "hee hee hee I'm a Mexican so I can make fun of them isn't that funny" comedians (I hope Carlos Mencia dies), and the "hey I take drugs isn't that funny" comedians. Dime a dozen. As far as I know the only people who like Dane Cook have crushes on him.
Some comedians with real wit and skill:
George Carlin
YouTube - George Carlin - There's a reason education in America sucks!
Gallagher
YouTube - Gallagher's Giant Couch
Bill Cosby
YouTube - Bill Cosby - Chocolate cake
Paula Poundstone
YouTube - Paula Poundstone on Letterman
Steven Wright
YouTube - Steven Wright on the Tonight Show, Guest Host: Joan Rivers
Emo Phillips
YouTube - Emo - Higher Learning
And of course Mitch Hedberg, but somebody already listed him.