The failures are aggregate, and well known. Any one pick can easily be defended or excused. LG Jr. wasn't even a real-first-rounder (taken 39th), the true issue in 2011 was probably not having a first-round pick to begin with (though that was still a good draft with Roman Quinn, Morgan, Asche and Giles). Moniak was one of 10 players they could have taken in 2016 who did not pan out (even Ian Anderson has faltered this year) and there were 10 more they could have taken we would have liked even less at the time (i.e. if they want completely off board). Randolph was a miss but same thing really.
The exception in both 2015 and 2016 are the Dodgers' picks at the end of the round, and there's probably a reason every team but the Dodgers missed on them. It will be another five years before we'll know if the Barber/Dombrowski era can truly change history or at least erase what the previous three regimes (Gillick/Amaro/Klentak) failed to improve, whether they tried to (Klentak) or just stayed the course (Amaro).