I found Curtis's looks off-putting before he ever opened his mouth in the first audition. He can't help having teeny weeny eyes but when he closes them to slits & makes all the grimaces he looks comical & then he draws out his notes as though he has to slow down so we can enjoy every nuance. Even if he hadn't been obnoxious in the group round I wouldn't have been drawn to him. He does have a good voice but there are plenty of great singers in the world - I believe I can do without him just fine.
Re his mother - you can sure see where he got his looks.