I'm not sure how you can even grade his work without the details of the organizations inner workings. Mark Davis neutered him after Dennis Allen was fired, vetoing FA signings(Saffold who's actually a very good player) hiring coaching(JDR, and Gruden) and feuding with player agents (Mack, Cooper).
The toxic power structure obviously had an impact on the philosophy of drafting players. 2012 draft we didn't have any picks, 2013 was a terrible draft, 2014 was a home run. 2015- forward Mark brings in his coaches reduced RMs power and the drafts tank. Obviously Mark polluted the draft room and organization with a power struggle.