You may think that their offense hasn't gotten the attention it should, and that's what I thought at first too. But then I looked at the team's Win Probability Added (WPA) breakout during their 25-5 run. Here it is:

Offense: -0.5 games
Defense: 10.5 games

If you look at their performance on a contextual basis, which is what WPA does, their pitching and fielding actually made up for a below-average contribution from the bats.