Check out my thread for my reactions to each band.
I forgot to include Divinity Destroyed--I had heard them before on a sampler from some other concert I was at, and boy do they suck. They are so vaginacore they make Opeth look like the ballsiest band around.
As for Petrucci looking like he should be in SOAD... Steve you're right, I just couldn't put my finger on it last night. He looks like that Sergei guy or whatever his name is.
And man... I am so sore, hoarse, and smelly right now. Haha. There wasn't even a pit thanks to the seating--Megadeth was just that fucking intense.