If it's based just on how the MLB club did, D/D-. A very bad year redeemed only some sporadic but much improved play over the last 2.5 months. This, though, takes into account lots of things that aren't under Getz's control.
If it's on how his changes/decisions affected the organization, I'd say better. Shane Smith, Meidroth, Vargas, Teel, Vasil, Tauchman, Perez, Houser were all solid to good at the MLB level. Bonemer looks like a really good pick right now. Antonacci, Bergolla, Montgomery, and several others looked good as well in MiLB. Obvious Hagen was up and down and that is a major piece that needs to work out. But not a flop yet, at all. I'd give him a C+ in that regard.