IMO there are two ways to be an "Ace".
1 is to be able to produce truly elite seasons, 7 WAR+, and to stay moderately healthy so you do that from time to time.
2 is the workhorse model where the guy just banks like 4+ WAR every year consistently. I'm thinking David Price in his 20s.
Berrios doesn't fit either model. He's like the workhorse version but just a hair shy on talent.