Since this is coming here, i'll go for Slipknot, Slayer and Anthrax. Except for HOF i've never even heard anything from the other bands, so I have no reaction to the rest of the lineup.
I like that this lineup looks shorter than years past. It's about time these festivals realized it should be quality over quantity. Hopefully this means the headliners will get longer and can actually play something that resembles a headline set instead of the hour long, mail it in sets all the headliners have done on mayhem before.