Brewers played really good baseball in March/April when they were actually healthy. Injuries and underperformance have definitely caught up with us since, but we still have an 8.5 game advantage and are finally getting some guys back while Corbin Burnes is beginning to pitch like Corbin Burnes and Yelich is looking more like Yelich, etc.
8.5 games and below 3 teams is a lot, even in June. Why they currently have an 11% chance of making the playoffs. It's also worth remembering that they have less games against the NL Central to make up that deficit this year...
I'm not counting the Cardinals out by any stretch. I'm just not that worried about them right now because they've been a bad team from opening day.