Strangely, the AS-700 measures pretty strong. I wonder if the tests you read had the Yamaha impedance switch on the back in the low-impedance position (or am I misinterpreting these test results?).
(Note - Australian currency for pricing)
http://www.avhub.com.au/product-reviews/hi-fi/yamaha-a-s700-integrated-amplifier-393552
Don't bother to read the linked pages, but, rather, go to page three and click the "Test Results" image. I believe it includes the same text, but adds charts and graphs of test results.
This is marketing stupidity on Yamaha's part! If you are measuring performance at 4 ohms, per Yamaha's design you would engage the low-Z switch. If the amps you researched showed poor performance into 4 ohms, I think this may likely be the culprit. AH reviews of Yamaha equipment with this switch have stated several times that you should not ever use the Low-Z under any normal circumstance.
I am pretty sure that the A-S701 is the same amp as the A-S700, but adds a DAC and "auto power on-off" modes.
If we look at it from the defacto magazine test standard of continuous power into 2 channels at 1kHz (and with switch on high impedance setting) it delivers 130W into 8 ohms and 190W into 4 ohms.