I had been to the Met Burger Bar twice at the Natick Collection ans had two different great burgers. I really enjoyed "The Farm" with applewood smoked bacon, Cabot cheddar and a fried egg.
I just went to the new Met at Legacy Place in Dedham. Fair warning: it is not the same "Met Burger Bar". My burger seemed to be about a 1/4lb (instead of what seemed to be about a 1/3lb in Natick) and the worst part was that there wasn't any visual or taste evidence that it had been flame broiled. It looked at tasted like it had been baked. If it hadn't been for the Maytag blue cheese that was on it, it would've been inedible. I'm certain that they didn't use the same custom vertical broiler that was used in Natick. One sign is that the "M" wasn't imprinted in the burger.