here is Paul Goldberger's review of the barnes from vanity fair
http://www.vanityfair.com/online/daily/2012/05/barnes-foundation-building-tod-williams-billie-tsien
poor inga saffron, compared to Paul G. her reiew is very second rate. She says the barnes is cut off from the city. It turns out the new barnes is oriented exactly like the old with the main gallery's back wall facing south onto the parkway. the reason the entrance is not on the parkway is two fold: (1)The desire to oriente the building exactly like the old barnes and (2)the desire to force the visitor to walk from the noise of the street through a quiet increasingly garden like path that helps one get into a more contemplative mood in preperation for entering the galleries.
The Art Museum is the essence of a Beaux Arts plan, the building itself and the way it is linked to City Hall across a grand avenue. As you walk or drive down the parkway and pass the barnes the south elevation presents a somewhat abstract version of a formal momumental Beaux Arts building. The Jerusalem lime stone creates a rich lively surface worthy of the other buildings east and west of it on the parkway.
It's also interesting that although you might say the barnes was only 5 miles away in merion so it already was part of philadelphia's art complex, it now is becoming evident that the synergism form the move is much greater than anyone thought. In 2009 the barnes has a membership of 390 people now it is 18,000 and increasing every day.
My wife and I are going Sunday May 20th so I'll comment again after that.