Nunez is a completely different player at 3rd than at 2nd. This definitely improves the infield defense; Kinsler playing 2nd doesn't hurt either. Kudos to Holt for his excellent stint at 2nd base.
Btw, when is the inferior NL going to grow up and adopt the DH? Most pitchers have a tough enough time just pitching; why have them bat? And pease don't bring up that strategy BS.