Why do people hate DreTL?

I genuinely just don't get it. I understand if you think he didn't deserve to win (personally, I did) and I get that he has major issues staying on beat (+ a lot of people dislike his accent / 'mumbling' style, I personally like it though), but (imo) he's still a good rapper. In a season which I believe was mostly comprised of bad rappers, he was definitely a cut well above the rest. I know that he's not everyone's style and a lot of people are upset that he won over Jay Taj, but he's still a great rapper and I think he was equally deserving of the win.

EDIT - I'm not looking for an argument as to who deserved to win the season, or if Dre is a good rapper or not. I'm just genuinely curious as to why he gets so much hate.