Many truths in this but ultimately it's the fan in the stadium not the stadium that creates the atmosphere. Old Wembley was far, far worse for views than New Wembley. At old Wembley you were miles from the pitch. At our Cup Finals in the 80's I hardly saw a thing, but the atmosphere in everyone of those games was the greatest I have ever experienced at any game. Both the Man City games I couldn't even hear my own voice. There is so much spoken about roof's being key to atmosphere in stadiums but in Argentina, where the fans are arguably the loudest most vocal of all fans anywhere on the planet, not one stadium has a roof! At the Monumental there is also a running track around the pitch, yet still a worthy atmosphere is created.
For me the ingredients needed are young fans (that means cheap/affordable tickets), standing and the removal of PA Systems. There are many, many things that contribute but the overwhelming common denominator is young fans and standing no matter what country, what stadium.