Part of the bad sounding acoustic problem is that players have to set up in a minimal amount of time, and they're typically running their own sound. There are great players on Broadway, but most of the venues just see them as nameless entertainment. The tourists want to hear music they know, so you're guaranteed to hear the same tunes over and over, even at the better places. Next time you go, check out the other areas of town. East Nashville has a ton of great venues where it's mostly original. The 5-Spot, The Cobra, The Basement East, etc.