Drooling over Hellfest's line-up is always silly. In one long list, sure it looks like a hell of a bill.
But when you consider that 80% of them will play no more than 40 minutes, and most of them will play at the same time, it's not better than most other festivals, and not as good as many others. Look at that Priest setlist. Even they didn't get that long to play.
Festival line-ups should only be rated in context: http://www.jukeboxmetal.com/wp-conte...nningorder.pdf
Not to mention the number of cancellations they have every year. This year: Lock Up, Satantic Warmaster, Disturbed, Unleashed, Black Rain, Skeletonwitch, Gorguts, Masters of Reality, Trust, Wayne Static, Anal Cunt (obviously), Buzzov*en and The Gates of Slumber all cancelled. Way more than any other major festival.