I will guess it was done by one of the semi-regular AVS guys, Monte, that seems to have a hate on for the M3 due to it's lack of a 'true' crossover and also has bashed the rest of the Axiom lineup without ever hearing any other Axiom speaker last I remember anything from him.

M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70