I don't know what it is with Belgian crowds. Sometimes they're great (1993/2001), sometimes they're downright boring.
In 1988, Jon got so pissed he threw out Wanted and made a snarky remark at the beginning of Prayer. In 2011, this video makes it seem like they're witnessing a funeral:
And that was a proper band show with a decent setlist!
Of course that doesn't justify the below-par performance from last night (from what I've seen on videos).