The food is WAY overpriced, but people should go there to support the singing servers. It is a major tourist trap, so I would suggest just going there once or twice and then being done. Frankly, I prefer the restaurant's counterpart in London, the Theatre Cafe Diner. The same type of establishment. The food is reasonably priced, and the service is wonderful. Not to mention, they, too, have incredibly talented servers singing their hearts out!
The idea is to work and to experiment. Some things will be creatively successful, some things will succeed at the box office, and some things will only - which is the biggest only - teach you things that see the future. And they're probably as valuable as any of your successes. -Harold Prince