I can agree with that. Their mentality isn't as strong as Bayern Munich which is the point they are losing the title to them regularly. That game you mentioned was really unbelievable and I don't want to remember it often honestly. 
Dortmund just handed over a huge chance to break this title streak of Bayern Munich.
Anyway I mean at least Dortmund are able to stay as one of top teams in the league. Their placement in the standings has always been at a satisfying level. Maybe they can't become the champions but they can at least keep the same level every season.
It must be admitted and Dortmund is always able to maintain a consistent team to remain at the top of the Bundesliga standings even though they always sell star players in their team. Dortmund just handed over a huge chance to break this title streak of Bayern Munich.Anyway I mean at least Dortmund are able to stay as one of top teams in the league. Their placement in the standings has always been at a satisfying level. Maybe they can't become the champions but they can at least keep the same level every season.
And this is all due to the absence of tight competition, but in my opinion this season is different, there are several teams that appear stronger and threaten Dortmund's position at the top of the standings.
And it is true that Bayern Munich have won the Bundesliga for 11 consecutive seasons, don't ask about their mentality, they are very strong and also if you look at the quality of the Bayern team, they are always far superior to other Bundesliga teams.