3 takeaways from Bayern Munich's win over Dortmund: No one can stop that attack

Bayern Munich roared to their eighth win to start the Bundesliga season with a 5-1 beating of Borussia Dortmund on Sunday.

Thomas Muller built a two-goal lead for Bayern, Pierre-Emerick Aubameyang cut the deficit in half for Dortmund, and Robert Lewandowski put an insurmountable distance between the sides with a brace of his own.

Mario Gotze added a fifth as Bayern ran away with the three points.

Here are the three biggest takeaways:

Dortmund lost due to poor defending and goalkeeping

Four of the five goals were preventable, including two balls from Jerome Boateng that eluded Dortmund's defence. Goalkeeper Roman Burki, who has supplanted the 35-year-old Roman Weidenfeller in Bundesliga play, didn't do much to help the cause. He picked poor times to come out of his net and failed to communicate with his defenders.

By the 66th minute, Dortmund dropped its guard completely. Gotze jumped on a loose ball in the penalty areas as the players in yellow watched the game slip away.

It was that kind of sloppy defending that ruined any hope of a comeback. Unfortunately, it's not the first time Dortmund received a whallopping at the hands of Bayern:

Lewandowski is always in position to score

Lewandowski isn't done breaking records. He now has nine goals in three Bundesliga matches and 12 in his past four in all competitions. While the two on Sunday weren't highlight-reel material, they were efficient. The 27-year-old simply puts himself in a position to score. He uses patience and timing, getting on the end of passes from far and wide.

Lewandowski's the kind of player who needs service. Fortunately for him, Bayern is loaded with playmakers who continue to serve up the goods. One particular goal was a familiar sight for fans of Dortmund: Gotze sent in a cross to Lewandowski, who snuck behind the defence and tapped in an easy ball.

Aubameyang is quietly having himself a season

Let's spare a thought for Aubameyang, whose exploits this season are also setting new standards. He's just doing it in the shadows.

Aubameyang is a close second to Lewandowski in the Bundesliga scoring race with 10 goals. In the process, he became the first player in Bundesliga history to find the net in the first eight matches of the season, according to Squawka.

His goal was like Lewandowski's, too. They're similar in stature - Aubameyang is just over an inch taller - and they're lethal with the few opportunities they get.

In that sense, Aubameyang fills the void left by his Polish counterpart in the Dortmund lineup, but he's not going to win games by himself.