Yeah, it depends on a case by case basis. I remember Metallica played the black album in reverse order, and I guess it works to end up with Sad But True and Enter Sandman, but they also played Ride the Lightning in reverse order. WTF? why would you start that section of the show with a bigass epic and close it with a perfect opener? the album order was perfect! opener, fast song, mid tempo, slower one, other stuff, one of their most famous and acclaimed songs and finally the kickass instrumental epic. I wonder who though the reverse order was a nice idea for that album.