That's too bad about Crysis II, but at least it could run! Ive continually been impressed with the gaming capabilities of the MBA, and I think its perfect for casual portable gaming. This past weekend I just finished Prince of Persia Forgotten Sands on it without any problems at medium settings, Ive had many a great Starcraft II battle on it, and right now Im playing Amnesia and Lara Croft Guardians of Light on it nice and smoothly. Honestly, out of my game collection theres not much that this machine hasnt been able to run, and Id bet that it can play a good portion of modern games out there, albeit at low to medium settings.
I sold my Alienware M11x to get the MBA, and so far Ive been able to play all of the games I had on my old M11x on my MBA just fine. Im more than happy to trade a little hit in graphical quality and frame rates for an extremely well built, light, aesthetically pleasing ultraportable.