Virtually the entire range of the parameter is now a sweet spot. Don't try to dial up your amps using the settings from 2.0, 1.0 or Gen1. Use your ears.... and trust them.
I agree. It feels like a good tube amp where the basic amp controls(drive,master,bass,etc) can be all over the place, within reason, and it still sounds good. I have found with 3.0 that looking up actual amp settings on how people dial in the real amp that the model is based on is relevent more now than ever. Go find a good youtube video where someone is demoing an amp found in the Axe-Fx II in a proper recording environment using a cabinet that you have an IR for (i.e. Mesa 4x12 V30). Watch them vary the settings on the amp, and you do the same on the Axe-FX. The small variations that are there are probably more due to different player, guitar, mic preamp, microphone, room, etc than the amp model. I will say that the microphone selection does not always translate. Example: A SM57 on high gain tones can make an amp sound "fizzy" depending on how you mic the cabinet. In the Axe-Fx the IR's seem to recorded with an extremely flat microphone, and when you select a microphone you overlay its "response" on top of the cabinet IR so to speak. In real life you would move the mic around until you found its sweet spot for the particular tone, so buying the Redwirez IR's would probably give a better 1:1 comparison with the real world.