Until recently, we had a crappy team and a crappy farm system. All under Rizzo
And a 7 year run of dominating the NL East, including 3 division titles, a wild-card appearance, and world series victory, again, all under Rizzo.
I think he performed under tight ownership limitations. Ownership handled the biggest Boras contracts, ownership vetoed the Harper deal, ownership had to buy off on increments of spending during the season when we were in contention, too. I think that may have led to some of the stripping of the farm system. The Treinen / Luzardo trade, Rivero for Melancon, the Eaton deal, etc... were trading the only currency we had for necessary pieces. Meyer I think for Revere or Span was an underrated deal.
If he's to blame for anything, I think it is failing to maximize his pitching draft choices. If Fedde comes back from Korea as a capable starter I think we will all pull our hair out. He seemed to be willing to take an awful lot of chances on health when he drafted, and, surprise, we have a lot of lame pitchers. That said, if Fedde does come back, and Rutledge becomes a contributor, then we look at the pitching picks a bit differently.
There's no question the team was slow to embrace modern data to help improve performance. Again, I'm inclined to say the Lerners did not pay attention to the development process rather than Rizzo failing to appreciate it.