I personally thought Motorhead was the second best band on the main stage (aside from Slayer obviously), although you really couldn't understand a thing Lemmy was saying. I thought AILD was really boring and Slipknot was fucking terrible.
9/11-13 Riot Fest
9/19 Uncle Acid & the Deadbeats
9/25 Cattle Decapitation
9/26 D.R.I. and/or Alcest