Bingo.
Barnes is tied for second in the AL and for 4th in the majors in saves with 24. He's converted 24 of 29 on the year so he has 5 blown saves. So does the AL leader in saves, Hendriks of the White Sox(26/31). The guy he's tied with, the Angels' Iglesias is also 24/29. Chapman, who we would all agree has much better raw stuff than probably all of these pitchers, is 23/27.
The major league leader in saves is Melancon with the Padres, he's blown, wait for it, 5 (33/38). Reyes of the Cardinals has a great percentage at 25/26 and the Giants' McGee is 24/26.
Mariano Rivera was the Yankees' main closer for 16 seasons and pitched in 19 seasons for them. He blew 80 saves in his career (regular season), or roughly 5 per year. Is anyone here seriously comparing Barnes with the GOAT?
Barnes has done a good job overall. He didn't have his curve. He can get away with the curve only better than he can get away with the fastball only, but he really needs both working on a given day.