You just making that up? Any proof that the rev B MacBook Air's "freeze up" when doing something graphic intensive like rendering in Photoshop or a game?
While the Air will not perform that well (though it does use the 9400M chipset) it isn't something to slag off - it is better than the original Core Duo MacBook Pro in some aspects.
Mid 2007 upgraded Black MacBook, Freeze up while just using GarageBand. Replacement Early 2009 15 inch Unibody MacBook Pro, Freeze up while using Mail, Safari, iWeb, iChat, Adium, iTunes and Apogee Maestro.
My guess, MacBook Airs will freeze up just like MBP's and MB's when put under alot of stress, Except MacBook Pro's can take more stress than the low power MacBook Air's.