I enjoyed Glasvegas at Croke Park in 2009 much more than u2 that night.
They played with the kind of fire that u2 used to have.
I wasn't lucky enough to see PJ Harvey open for them, but for me she is obviously the best artist they have had - her discography for me is stronger than theirs.
The biggest deal for the crowd i think i have seen was The Killers opening for them in Cardiff in 05.....there was no real noticeable difference in how busy it felt between their set and u2's - personally i think The Killers are shite so I wasn't bought in, but the crowd really were.
Cast were really good at the great Roundhay Park Popmart gig.
On a sort of related note I have always found u2 crowds probably the least appreciative and supportive of the support acts generally out of the artists i have seen.