Yep, I imagine a bit of both but definitely all about the music! You never really know what any of these people are like!
Well I don't have any frame of reference for a U2 gig as it's my only one but I do agree on the songs, in fact I don't think there's anything from the Line on the Horizon album that really stands out.
Will have to keep an eye out and see what price the tickets are going for!