Why do people say Adam can't sing?

I can understand that you guys don't like him and all, but to say he can't sing??? Wow. If he couldn't sing he would be gone months ago and he wouldn't be the front runner. Simon practically BEGGED that people vote for Adam. I hate Kris but I think he sings great. And that scream that he lets go, how many guys can hit that note?? Adam's gotta be one of the only guys in the world who can hit it. He got a standing O from Smokey Robinson and Simon. PLUS he's incredibly hot (not like that applies to his singing). So ya... why do you guys hate him?