We've seen many productions here and will see many more. Unlike some reviewers, I don't hold Gammage responsible for things like understudies stepping in. Things happen. But it is true that the sound (like sound in all similarly shaped structures of that era) isn't always the best, the parking situation isn't great and the lack of a middle aisle is inconvenient. That said, the facility does have its own charm and brings many quality productions to town. And the parking that is around the facility is usually free, so in some ways you're getting what you pay for on that front.
All in, more good than bad. This review would be 3.5 if I could pick a half star.