I have never seen Kamelot live before, but their live album was quite cherry. They did awesome, and there's no way I'd ever say otherwise of any band that played there unless they pulled some sort of malicious faux pas (like being too drunk and getting sick on stage, or intentionally pissing off the crowd)
I was disappointed with the sound though... as far as vocalists go:
pop stars/rapper < nu metal << death/black < progpower <= god < mathias < roy
And for the entire kamelot set (as well as many of the other sets) I was struggling to hear the vocals. I did notice Roy pulling the mic away, but I just figured that was one way he accented his vocals and the setup just wasn't calibrated right for him. And I have no clue who the female operatic vocals was, but half the time her mic was off and the other half she was BARELY audible. I really wanted her to do more singing, I love mixed vocals.
and OH MY GOD was she gorgeous!
edit:
I thought the fact he looked in agony was going along with the songs. Because he wasn't ALWAYS that way, I thought he was just getting into the music.
I'd disagree with that whole "george michael" thing. That's his thing. and I don't think it's a "george michael" thing. Sure the common thing for metalheads is to have long hair, followed by shaved heads, but there's no real reason you can't develop your own style