Eh, I need to listen what I have from 2002 year because I don't really remember how performances were good enough or not.
2000 - debut year with small stages, a lot of scream, I wouldn't touch it
2001 - EPIC
2002 - dunno
2003-2004 - AWESOME!
2005 - 2 shows, but Live 8 performance was very good so decide by one show its very hard
2006-2009 - AWESOME!
2010 - Still fresh but already ripped it up!
I think it would be 2005, poor 2005 with only 2 performances.
To tschenneck: maybe put 2005 in the competition was wrong idea because really you don't really know how they could perform only listening 1 show, I think we don't have other performance even audio recording, yes?