We attended the Tang Dynasty show and dumpling dinner on out recent visit to Xi'an. The dumpling dinner was fine. There were 16 different types of steamed dumplings to try. They are artfully prepared with generous portions. The show seemed to me more geared for the 60+ crowd. My teenage children were bored to tears after 15 minutes and my wife and I could barely keep out eyes open 30 minutes in. It is a 90 minutes show that could have easily been 60 minutes.
Everything is tastefully done, it is more of an folk opera than dinner show and so it was hard to stay engaged even though they explained everything in English.
This is a pass for families with small children.