Amirm noted significant operational problems with both units in his reviews, though the problems with the NAD seem more severe and unavoidable. A failure to spot the difference subjectively between a SINAD of 90dB and 94dB is going to surprise no-one who understands what these measurements mean. As
@abdo123 said, 'sounds much better' really doesn't mean anything without controls.
As for 'most audiophiles say', it's really just a case of 'most audiophiles are able to echo each other' - it's Stereophile class A+ after all!