To be the "glass half full" contrarian, I think we could come up with a pretty decent list of players the Sox have produced, and/or acquired early in their careers, and/or started with the Sox and went on to productive careers elsewhere, and/or reached their career peak with the Sox, just in the last 35 years, starting with:
Carlton Fisk (played more games with us than BOS)
Greg Walker (nice first half to his career)
Bobby Bonilla (we developed him)
Mike Cameron (we developed him)
Chad Bradford (we developed him)
I think it's also fair to say these players grown elsewhere reached their career peaks with the Sox:
You may now continue with your "woe is me" pity party.
The universe is the practical joke of the General at the expense of the Particular, quoth Frater Perdurabo, and laughed. The disciples nearest him wept, seeing the Universal Sorrow. Others laughed, seeing the Universal Joke. Others wept. Others laughed. Others wept because they couldn't see the Joke, and others laughed lest they should be thought not to see the Joke. But though FRATER laughed openly, he wept secretly; and really he neither laughed nor wept. Nor did he mean what he said.