When Barnes first came up, he looked absolutely lights out, but his command has been pretty spotty (sometimes outright bad) so it seems like it's difficult for him to be consistently reliable in high leverage situations. Barnes definitely gets more hate than he deserves though. His career ERA/FIP/xFIP/WAR is 3.56/3.55/3.66/1.6, those are pretty good numbers for a 6th/7th inning guy over parts of 4 seasons (including this year). I think I always thought he'd turn the corner and be dominant, but not expecting that anymore. His FB velocity is way down this year (93.8 vs. 96.4 career, 95.9 last year), so unless he can find better command he'll be in trouble. That said, extremely small sample size but his walk rate is way down this year and his K rate is actually up over last year. I think Barnes is pretty firmly somewhere in the middle of this pen. The fact that he has an option remaining is really the only reason why I'd expect him to get sent down at some point this year if he gets into a rut. Long story short, I like Barnes, he's probably better than most people seem to think, but if his velo stays down and that walk rate creeps back up, he'll never be consistent enough to be anything other than a solid middle reliever.