Even in the TACT and DEQx systems, you will see that they use rolloff on the high and low end. Generally, at reference levels, in addition ot other factors, fletcher-munson bbased acoustic principles call for a slight rolloff of those frequencies to achieve the proper tonal balance.
I think it is great that the Audyssey system is being incorporated into Denon products and believe that it is a much needed step in the right direction. Nevertheless, I was a bit disappointed and underwhelmed with the results I heard compared to the TACT and DEQx systems I have tested and use in my setups. It seems that the Audyssey system really only addresses frequency response issues, which limits its impact, especially in a multichannel system.
While I understand that more complex room correction technology requires more processing power and that existing products are out of the price range for normal consumer products, I would think that the reviewers at Audioholics would spend more time studying and learning about those products. They have a dramatic benefical effect on the way a system can sound and really should paint the path for the future of audio. If sound is what you care about, there is no reason not to be looking at and understanding the technology now. It has been out for quite some time and really deserves more attention.
Again though, it is great seeing some form of correction beng incorporated into consumer products, as the Audyssey system certainly improves things, and at the very least, will make more people aware of the concept of room correction.