I don't understand the concept of feeling guilty because you like something. I guess that I'm just weird.
Well, I'd say mine is Between the Buried and Me's Colors. I love that album.
Toxicity was one of the best metal albums of the 2000's, so there is nothing for you to feel guilty about.
You're a noob, but you're right. I didn't even think about that.
I guess out of my list, the two that fit would be:
Cradle of Filth
Mudvayne
Also: In Flames entire discography.
Although Tool shouldn't be frowned on by anyone!
They have given me enough reason to disagree.