Perhaps he isn't like that in person, but he comes off that way in interviews. Just like Taylor comes off as a nut and Kat comes off as a ditz in interviews. They all need a little coaching in the interview department.
As for his talent, I am perfectly able to judge that one on my own. I appreciate a good voice which is why 90% of the male voices on Idol don't impress me at all. It seems the women, from Kelly to Carrie to Kat, have the men beat hands down when it comes to quality of voice. The men just sound like wanna-be rockers. The few that have at least a milligram of talent and lots of charisma, like Chris and Taylor, are worthy of some admiration, but I'm still not wowed by any of them.