The reason I hate Dane Cook started off with his standup. First of all, look at the guy. He's a frat boy. Second of all, all his humor follows this basic forumla: "HEY YOU KNOW WHEN YOU'RE DOING SOMETHING AND THEN YOU DO THIS AND THEN YOU YELL AT SOMEONE AND THEN YOUR FRIEND COMES AND EVERYONE'S GOT THAT ONE FRIEND" It's all based on yelling and being ostentatious and dancing around on stage. He steals jokes from other comedians, and is basically kind of a living monument to unfunny. It's not as egregious as Carlos Mencia, but operates at the same level.
Then, he went into movies. More yelling. More being ostentatious.