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If base MBA 13" 2013 can (in med settings), why rMBP 13" cannot? I saw vid of that, ~40 fps.

You can check at notebookcheck to see at what fps it will run.
 
With all settings on HIGH:

2880x1800 - 8-11fps
1770x1106 - 20-25fps
1288x806 - 32-38fps

I don't get people who demand 60fps. Playing at 20-25fps on 1770x1106 is very pretty, smooth, and responsive. No complaints. Didn't see much of a difference when lowering quality settings. Limits seem to be based on resolution.
 
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