The 2020 Seattle Mariners stable of arms were actually quite a bit better than we thought they would be. The starters ranked 15th in ERA. They ranked 8th in innings pitched. They ranked 9th in walks allowed and 9th in opponent batting average. By and large, the Mariners starting pitchers ranked among the top half in just about every meaningful category.
Where the team struggled AND I MEAN STRUGGLED was in the bullpen. Mariners relievers ranked 28th in ERA, 27th in WHIP and 26th in opponent batting average. Were it not for the utterly historically bad Phillies and Red Sox bullpens, the Mariners bullpen would have likely been a bigger story.