The JPR regime was pretty awful at drafting/developing players. Off the top of my head, Adam Lind/Aaron Hill/Shaun Marcum/Ricky Romero were probably the best to come out of his draft picks.
As for AA, he did build up the farm system very well during his time here and used those prospects as assets in trades. Did all of them turn into superstars? Not really other than Syndergaard for a couple of years with the Mets before he got injured. Matt Boyd, Jeff Hoffman, Travis d'Arnaud turned out to be alright down the road. For the Jays who they kept, arms like Stroman, Sanchez, and Osuna turned out to be really good. Devon Travis was a very nice trade - too bad he never managed to stay healthy. AA did sign Vladdy as an International FA and well he's the superstar of this team now, so that's gotta mean something. But yeah he wasn't turning out superstars or elite guys with every pick/prospect if that's the point you're trying to make. Wouldn't say the AA regime was awful at drafting/developing players.