You sound like a spurned lover OT. While Joe *IS* a 15-game risk, he doesnt have an abnormal number of injury chances (ala Clemente). And his 0-arm isnt a deterrent like say Willie Mays, but I think you need to look at things holistically.
Does Joe DiMaggio create more runs then he gives up defensively? I would say based on some of the stats posted, yes. On the other hand, I would definitely have a strong arm in RF if I had Joe in CF.