I've always HATED Vegas...until this last trip. Unfortunately, Tao was the one blight on the trip. The food was ok and the bill wasn't outrageous, which can be a typical Vegas pitfall.
We ate family-style and had a roll that I'm fairly certain is an exact rendition of fish-food., which was partly our fault for eating sushi on a Sunday. The food came out so quickly that we didn't really have much time to enjoy our meal. That is not to say that they were trying to turn the table over though, it took about 45 minutes to receive our bill and pay for it.
Bottom-line: the food was mostly edible and the service was alright.