Drew's average season in Boston consisted of a .264/.370/.455 (.824 OPS, 114 OPS+) comfortably above the average RF production of .267/.327/.457 (.784 OPS). He wasn't "elite", but he was comfortably above average in his "mean average value".
Also, you are presenting an interesting strawman here, since i can't find anyone mentioning Drew as one of the "Elite RF's" in Red Sox history. That was never the point. The point that the people defending Drew are presenting, and correctly so, is that statistically speaking, Drew was an above average ballplayer offensively and defensively when he was on the field during his tenure here. The "When" being the biggest issue. There is also some hyperbole from that side of the fence when presenting Drew's value.
The answer is in between the opinions presented here. He wasn't average, he was above average, but he wasn't "elite" in terms of MLB during his years in Boston (2007-2011). He was, again, above average.
Can we all agree here, objectively, from what the statistics actually show?