Completely agreed. The way these receivers are being rated is quite debatable. Most are rated at 2 or even 1 channel driven at 4 or 6 ohms with high distortion levels. So while driving 5 or 7 channels the usable power output drops drastically.
Refer this video for some quick "gyan" on AVR power ratings and how they are fudged.
https://youtu.be/Fl3_AQBISYE