Do you weight all defensive positions equally?
I like to think of Manny Ramirez in conversations like these. He really should have been a full time DH, but they also had Ortiz, so that made it hard. LF in Fenway isn't that difficult (you probably remember, he played RF in Cleveland, but no way they could put him out there in Boston) and he did actually have a knack of throwing out baserunners, but he was overall a buffoon defensively.
Then again, he was worth a little more than 10 runs offensively.