Tanya and I went to T.Z. last July. Don't miss it, it's a blast. I have friends that went after we did that have since gone 2 or 3 times.
The fun outpaces the food. The salmon entree wasn't overcooked, but wasn't memorable. The salad was a simple affair. The carrot soup was tasty. The antipasto platter was basic, but it was at the table when we arrived, so there were no lingering hungries. We had a bottle of 98 Voss Sauvignon Blanc with the meal. This is one of my favorite S.V.s. Neither of us can remember the dessert.
Get a table as close to center as possible, even if it means sharing. Unless you are the shy type. The central tables often get "involved" with the show.
Give it a try. It was one of my most memorable dates with my (now) fiance'.
My sister and some friends went, and also my other sister and brother in law when it was up in Seattle. Both loved it, but neither are real chowhounds, so they didn't say much about the food, only the experience, which was by all accounts great. On the other hand, if the food had been bad, I think they would have at least mentioned it.