I've just that I've never read so many negative reports about a U2 show. I saw them in '85 at Milton Keynes with REM, The Ramones and Billy Bragg (oh the mud), then Live Aid at Wembley, then Melbourne in the late Eighties, all great, great shows.
It's not the trolls and whingers, but real people who were there. I'm going tomorrow night with a truly positive outlook (have to!), but any band who has toured such a massive show for so many shows has to be constantly aware of their audience's expectations to keep it fresh. I'll report back on Saturday for what it's worth.