It is a strawman for two reasons:
First: Because you are assigning the imaginary position that someone here believes that stats "tell the whole story" about the game of baseball. No one on this board has expressed that opinion. My mentioning the pitching stats was a tongue-in-cheek comment that even if the poster was (and he wasn't) using stats as a barometer to identify the performance of the 2011 Red Sox , then he should have used pitching and defensive stats, which may have painted a clearer picture of the inherent problems with the club, although an incomplete one, because the problems with this team last year went beyond simply measuring performance. You jumped in at the incomplete analysis to support your agenda.
Second: The poster who you are quoting did not mean "mediocre" in terms of the division, he was talking about MLB, and a 90 win team in MLB is not mediocre by any stretch of the imagination, unless you assign your personal interpretation, which, in this case, is "mediocre in the division". Don't move the goalposts to support your argument.
I know you think stats aren't the be-all, end- all, which is actually the truth, but they are a useful tool for evaluating player performance. No need to discredit them every chance you get.
By the way, E1's original post was a misinterpretation of a previous 700hitter post, in which he said that a 25-man roster full of 8 million players would be a $200 million team of mediocrity. So you were misinterpreting a misinterpretation, which i find interesting.