This begs the question of who is the better team in a given series.
As others have mentioned, playoff baseball is a significantly different animal than regular season baseball, and the team with the better record in the regular season might not be better structured to win a postseason series over an opponent that won fewer regular season games.
With injuries to key players or trade deadline moves a team's playoff roster might be significantly different than it was at times during the regular season. And a team with multiple veteran superstar and future HOF players might be more potent in a short playoff series than one that scrapped and clawed its way through the regular season with several relatively inexperienced players.
Despite having the best regular season record in MLB, I'm sure the Brewers would be underdogs against several teams (such as the Dodgers and Phillies) and only slight favorites at best against any playoff team.
Maybe the randomness of baseball will prove to be a good thing for the Brewers.