If you go by Win Shares then the rookies with the most impact this season are Mason Plumlee (3.1), Tim Hardaway (2.5), Steven Adams (2.2), Kelly Olynyk (2.1), and Ryan Kelly (1.8).
Len is 16th with a 0.4 Win Share and Goodwin is -0.1, but that does not worry me since we all knew that they were...