Definitely agree with your thinking regarding usefulness and limitations of Audyssey. I do think that the Pro kit is a nice tool to have in your toolbox, if not for MRC and HF roll-off shape flexibility, then at least for the individually calibrated +/-0.5dB sensitive mic vs +/-2dB for the consumer mic. A REW setup for post-calibration measurements is also a must as a reality check. But obviously, any sensible approach would start with good speakers, room treatments and correct placement, all of which should get you 90% of the way.