facts matter.
They were great, clearly. Just looking at production during games played in the outfield, so not even counting Martinez' time at DH, the Red Sox outfielders were first in average (.300), on-base percentage (.380), slugging percentage (.518), OPS (.899), wOBA (.381), wRC+ (139), Wins Above Replacement (18.6), and ... well, you get the point. The Red Sox won 108 games and the World Series. The outfield was a big part of why.
They were so great, in fact, that they ranked as one of the best collections in history.