On the whole then,yay or nay...I've had a look on festivals united and there's people who seem converted by Rock Im Park, I can imagine it might be different if it was a washout as RaR is tarmac.
The hotel side would be more to convince the non campers if it's an option. On my first visit to rock am ring we were shuttled into the area where you could stick the car next to the tent which was fantastic as it meant zero lugging of camping gear.
An interesting thing this. Having seem them several times (some of their gigs veer into back catalogue niche territoty), I partly agree they arent Pyramid material (theough modern defeinition of 'bangers' although I could see them headlinging the Other stage) I can't think of another festival in the world that they couldn't headline - Reading, IoW, BST, Rock Wercheter, Roskilde, etc etc.