I have been to luaus on Oahu and Maui and have always had good experiences, but Smith Family has the worst PERFORMANCE I have seen. The garden was a bit cheesy, but lush and expansive, and the food and drinks were wonderful, but the performance was a "modern" luau, and I noticed people leaving soon after it started. And it was the most expensive luau I've been to.
Go to one on another island--supposedly this is the best one on Kauai. Scary!