Red Celt -
The only real gripe I had as a listener was the echoing caused by hard indoor walls. It muddied up (there's that mud thing again *L*) intricate details of the sound quite a bit. It's a tough setting to deal with acoustically, because of the room materials and geometry, but I thought the sound guys did a good job on balance overall. Maybe y'all could drape curtains along the walls similar to the ones separating the big stages from the vendor area to help them out a little bit. Outdoor sound was well run at all the shows I caught.
~S~