Someone can correct me if I'm wrong, but the club didn't do as poorly in the 20's as many assume. They had a handful of second place finishes and that's not chopped liver. Of course, it's not the brass ring, as it were.
What I did notice is that the club certainly did not take part in the home run explosion that hit the game. In most seasons we were either last or near to last in home runs. I didn't follow it all the way through the 30's, but I'm think Ernie Lombardi's 20 homers in 1939 may have been the first time the team had a 20 homer season (although somewhere in the back of my mind, I'm thinking there was a 19th century player who hit a ton for that era - not 20 though). I don't know that we really became a home run hitting club until the 1950's. And as WOY keeps pointing out, we've relied on that since until these recent years when we've emphasized pitching (although, IMO, some of those early to mid 60's teams had some decent pitching).