I guess the "airyness" everyone's missing from the cabs in the AxeFX comes from the fact that it is limited to 1024 samples, thus, as Jay has stated several times, NOT reproducing any reflections.
Every recording we've done or heard with real cabs and mics, does have room reflection in, and it's mostly where the "air" feeling comes from.
What we really need are some more reverb factory presets to emulate THAT sort of early reflection ambience, like the Lexicon units have to an extent. Something stupidly simple like "Dark Ambience, Neutral Ambience, Bright Ambience" would be great starting points.
What Dutch has done in the Raw Amp/Cab Bank is already great, and I've been using that all the time (thanks man!), so some presets based on that would help tons, even with user cabs.
Just listen to RedWirez on a DAW and then the Axe, and you'll notice the difference instantly.
Best,
Alex