I just traded in my '11 and noticed that the AC does blow, literally. Took it to the dealer and he said to start using the recirculation button. After that, this OKC heat was tolerable.
The new '12 I traded for has the same issue. Use recirculation and it helps. The '11 Buick Lacrosse loaner that they gave me had an awesome AC, though so I'm wondering what Chevy forgot to do that has us griping about it.