When I read the title of this thread, I knew immediately that three names were going to be on many people's lists...
Jiko - Clearly it's not for everyone because of the "exoticness" of the menu. But you should know that going in. If you're not at least a little bit daring when it comes to food, you're better off somewhere else.
Le Cellier - It would be impossible for this restaurant to live up to its hype. There's no doubt it's a good restaurant, but if you think it's a world-beater, and the best meal you'll ever have, you're going to be disappointed.
'Ohana - Family-style is immediately going to turn some people off. And the food is also somewhat on the daring side.
There's often an expectation of greatness, especially with the signatures. If a restaurant is not "great" for one reason or another, there's going to be a letdown.
I think Jiko really is a great restaurant, but some people just simply aren't going to like it. Le Cellier should have something for everyone, and it's a more than decent restaurant. 'Ohana is what it is.