I was thinking the same thing!
Anywho, I had the opportunity my last game to sit in tier 2 - I thought the concourse was just fine and access to/from to be okay. And in theory, as mentioned before, it should be serving half the people in the arena, where as the CAA had a concourse that size servicing the entire arena.
At no point in time did I feel like Moo-ing while walking through there.
And opening night I thought it was too quiet, but the second game I went to everything sounded just fine. I think when you compare the pluses with the minuses, we come out on top here.