a couple of reasons.
1) His Kos fight. That fight pissed me off so much I wanna punch my tv even thinking about it.
2)He is crazy. Not like a funny crazy like Mayhem is, but like creepy crazy. He thinks God is like blessing him with uber power or something. Other fighters thank God which is cool, but he seems to think he is God or something.
3)He seems like a prick. If you look at him without really listening to him or watching him fight, you will imediatly think he is someone who thinks he's too cool for school or something
Those are the main 3 reasons I originally disliked him. He is exciting though