I tend to agree with Morey that talking down the style of play is neither good for the league, nor is it a valuable contribution. You can cast Morey as "biased" because he was one of the major contributors to the league's play style, but the commentators probably have equal bias, watching a style of play that's antithetical to the style that they made their fame coaching or playing in. It also makes them less fit to actually analyze the quality of the play and the tactics--just as someone who dislikes Chinese food would be ill-equipped to analyze the quality and the techniques of Chinese cooking for people who are interested in and enjoy Chinese food.