Dortmund are doing great at the moment. Dortmund is at the top of the points table after beating Bayern Munich. I think Dortmund won't be able to stay at the top of the points table for long because Bayern Munich will win the next matches very well and stay at the top of the points table.
Dortmund are at the top of the standings at the moment not after beating Bayern Munich, but this was obtained by Dortmund after Dortmund were able to beat Frankfurt at their own turf with a large score without any reply from Frankfurt. It was this victory that brought Dortmund to the top of the standings because at the same time Bayern Munich was defeated by Mainz so that Dortmund made it to the top of the standings after being able to win a lot over Frankfurt.
Dortmund are in the top now, Bayern Munich just made it so possible for Dortmund to lead this game. The way Bayern Munich have been performing I feel they will end the season with this poor performance having nothing for the season. This is an opportunity for Dortmund to maintain this position.