For my wife and myself the biggest disappointment with regard to highly regarded restaurant was:
Restaurant Bernard Loiseau in Seaulieu, he was supposed to be one of the top chefs in France after Ducasse together with Blanc, haeberlin and Boyer. It has of course 3 stars in the Guide Michelin, but the food encountered was maximum 1 star, menu choice was uninspiring at best and the service - well no comment.
In the meantime as most of you know certainly I think last year bernard Loiseau committed suicide because there were downgrading his restaurant in particular in the Gault Millau, well I though the downgrading was well deserved.
On the American Continent, my biggest disappointment was Charlie Trotters in Chicago, which is supposed to be one of the best on the continent, but which in our opinion didn't live to the hype, in particular with regard to service and food, they really feel they are the greatest in the world, but hey they aren't and I will not even comment about the prices