I think this one's crap. The one with Slipknot, Slayer and Motorhead on it was OK, but three bands don't make a festival, and complaining about a shitty undercard is just as valid as complaining about headliners. Actually, more so for proper festivals (Mayhem doesn't have enough bands really, it's just a long gig). If you go to a festival you actually spend more time watching the lower bill than you do watching the headliners.
16/12 Metal All-Stars