Personally I dislike his music even more now because his voice is just horrible, puberty's ruined it and it always sounds strained, like a kid who's just gone through puberty is trying to sound like an adult with a high tenor, and he clearly can't hit those high notes anymore.
I think the reason why people hated him was because he had an arrogance about him from the word go but his management were constantly making him out to be this butter-wouldn't-melt do-gooder kid and would blame everyone but him for whatever happened. And the way he handled the baby-scandal thing, most people would've wanted that to be swept under the carpet and forget about it, whereas he has kept on talking about it and even made a song about it with the woman's name as the song title! That just makes me believe it was all planned by his management or label to give him a bit of an edge maybe and an excuse to make that song.