Unfortunately systems take time to settle and 3 days is no where near the amount of time needed for a setup to start really gelling. If these shows were able to give the designers 3 or 4 days before the show to get their sound going they would possibly (maybe) be able to play a wider range of music, or at lease have time to select more that sound passible for a showing, but a day of setup and then the show itself is never going to cut it.
Even though trade shows bring a lot of excitement for a couple of weeks to the hobby they're not a very good place to be making sound judgement. Maybe someday there will be audio expos instead of audio trade shows, or in addition to.
Michael Green