Lamb of God. They were on the same bill as Anthrax and Slayer a couple of years ago, and I was looking forward them as I've got a couple of albums and quite enjoyed them.
Anthrax were on before them, and were amazing.
LOG didn't look like they were even trying. They sounded tight, and were obviously well rehearsed, had a stage set up but just stood still throughout their recital (not a performance).
Funny thing is, Slayer did pretty much the same thing, but were just more entertaining.
Go figure.