Originally Posted by kittle42
It is questionable how important it is for judging pitchers, but for a team, I argue it is relevant. More relevant is runs allowed per game, which I think the Sox place 4th or 5th in the majors in, so same difference here.
Basically. ERA is nice overview stat, it tells you basically what you need to know but doesn't offer too much depth. It's basically the pitcher's equivalent of OPS. You can make some snap judgments based on those stats but if you really want to learn more about what's going on you need to dig deeper. Saying someone is a good pitcher because he has the best ERA in the league is a valid statement. Saying someone is the best pitcher in the league because he has the best ERA is more of a gray area.