Croke Park has regularly received stick on this site for lacking any atmosphere. While I agree fans are further back from the pitch for football I think this in reality does not take much away from anything. For example if Henry Shefflin, Brian O'Driscoll or Robbie Keane zip down the wing to score an excellent point/try/goal - what difference does it make to a hardcore fan's excitement if there are 2 yards away or 20 yards away.
A hopping atmosphere depends on the fans themselves, what happens on the pitch and the importance of the game and not simply the bricks and mortor of a stadium.
Saturday night pretty much ticked all 3 boxes above for the first time football has moved to Croker. Ireland v England 2007 6 nations also. If people think that the atmosphere for the Serbia, Georgia, Cyprus games would have being much better in the Aviva - they are fooling themselves. Poland and Brazil it was the away fans making the noise.
I was in the SS of the Lower Davin on Saturday night and after the anthem and after the 2 Irish goals the noise was incredible. Louder than I have ever experienced in any GAA game in fairness.