I remember John Lennon´s words now "our best ( Beatles ) album was never released"
I think the same situation happen with U2. With the exception of Zoo TV Live From Sidney and Red Rocks, all live videos have been quite dissapointing and average, really ( Talking about band performance, not about sound quality, lights, picture, etc, etc )
I´ve seen more than 20 live concert videos, and I´ve about 10 unreleased DVD bootlegs.
I really think there´re FAR BETTER performances than official ones like Pop Mart Mexico City 1997 ( Helsinsky 1997, Rotterdam 1997, Santiago 1998 and many others Pop Mart Pro- Shot concerts are far better by miles !!!
). Also there´re better filmed concerts than Boston 2001 ( Calgary 2001 is an example )
. Also there´re better performances than ones from Rattle & Hum, etc.
Loreley 1983 or Devore 1983 are better than official Red Rocks.
The only one I really believe is TRULY a great one is Zoo TV Sidney 1993