For your information, Europe isn't one country. In Italy, powermetal is quite popular. In the Netherlands, it isn't. We've always been more a prog-orientated festival/country.
Again, the fact that you don't like Orphaned Land or Meyvn (who got excellent reviews over here) is your personal opinion. A lot of our visitors asked for Orphaned Land and are happy to see them return. As far as I know, Labyrinth wasn't mentioned by anyone (with all respect to the band).
Like I said, you can't book the perfect line up. Even if we'd book Dream Theater, Symphony X, Fates Warning and Queensryche altogether... there'd still be people complaining. If you ask 1000 people for their perfect line up, you will get 1000 different festivals..