You are not alone :
No kidding! I've never been to Blue Hill. My wife went a few months ago for a work dinner and thought it was extremely mediocre. It's all well and good that the pork came from a pig named Frances who enjoyed Mozart and granny smith apples, but that matters little if the dish is dull.
I've been twice and was disappointed twice. However, the Stone Barns location is an entirely different story. Food is really incredible and the setting is really nice. We try to go once a year in the spring or fall, with a stop at Storm King for a little walk among the gigantic Calders and Serras.