Fair enough wire, but okay let's talk about the Yamaha. I could not find lab test data for the recent models but let's compare the older 7 channel surround models. The AVR330 and the RX-V657 were probably priced similarly in the U.S. but the AVR330 was priced much higher than the Yamaha in Canada.
According the lab test data from the S&V mag, the comparison between the HKAVR330 and Yamaha RX-V657 shows:
Output at clipping
1 channel at 8 ohms
RX-V657 - 181W
AVR330 - 95W
1 channel at 4 ohms
RX-V657 - 278W
AVR330 - 148W
5 channels at 8 ohms
RX-V657 – 67W
AVR330 – 66W
Stereo performance both channels driven at 8 ohms
RX-V657 - 129W
AVR330 - 86W
Stereo performance both channels driven at 4 ohms
RX-V657 - 188W
AVR330 - 25W (Reviewer said the protection circuit shut the system down)
Distortion at reference level
RX-V657 - 0.02%
AVR330 - 0.03%
Frequency response (Hz/dB)
20-20,000
RX-V657 - +0, -0.4
AVR330 - +0, -0.4
Frequency response analog input:
RX-V657 - <10 Hz to 104 kHz +0, –3 dB
AVR330 - <10 Hz to 72 kHz +0, –1 dB (–3 dB at 156 kHz)
If you want to check the details out yourself the links are:
http://www.soundandvisionmag.com/receivers/874/pioneer-vsx-74txvi-digital-surround-receiver.html
http://www.soundandvisionmag.com/assets/download/322004162858.pdf
The test data alone are probably not enough proof to say one is necessarily more powerful or sounding better than the other. My guess is that people might have been largely influenced by hearsays of claims (based on may be a couple of reviews and test data of some earlier models) that Yammies are weak, bright etc. to start with; and then the Placebo effect sets in during their subsequent listening sessions of their own.
The links have been posted several times before, but I hope by comparing some of the relevant test data of two at models at the opposite ends of the issue "conservatively rated versus exaggerated (some say lies) rated", one can see that it is the Watts/Dollar that really counts in the end.