I thought all three bands were excellent, and each brought something completely different to the table (or stage, rather).
Music is as subjective a topic as they come, so arguing about which band is better than which is completely pointless.
05/23 - Bryan Adams
06/19 - Riot V
06/28 - Mayhem
09/05 - Billy Joel
10/01 - Queensr˙che / Scorpions
10/24 - Opeth