I think people are in denial about the luck/circumstance stuff. That has always been a factor in baseball more than other sports, but the structure is such that a playoff series, whether a best of 3, 5 or 7, is not regular season baseball. The Brewers can go 26 deep on the margins of WAR and have mastered that, but when you don't have to pick up wins over 162 games and you just have to win 3 times, talent of your best 10 or 11 is what counts. They might be able to beat 1 team, I don't see them being able to beat 3 or 4.
They are losing these series because the opponents have more talented teams built to win head-to-head against the best. Can you look at any of these recent losses and say the Brewers had a better lineup than any of them?