The Teams in the Playoffs
I tend to stay away from broad claims about what it takes to be a playoff team because there are so many ways to build a winning team. For example, no one would claim that defense is unimportant, but if you are strong enough in other areas you can overcome a weak defense.
Among the teams currently slated to make the playoffs, we have the Yankees (27th in defensive WAR), the Astros (26th) and the Blue Jays (22nd).
What about strikeout rate? The Cubs have the highest strikeout rate and the Astros are second.
What about lack of power? The Pirates are 26th in ISO, the Cardinals 22nd and the Royals 21st.
What about a poor bullpen? The Rangers have the 5th highest FIP and the Yankees and Blue Jays are no better than average.
Starting pitching? The Rangers have the 6th highest FIP, the Royals are 10th and the Blue Jays 11th.