I agree with you this season Bayern Munich and Bayer Leverkusen are top teams competing for Bundesliga title. It is sad that Borussia Dortmund is not as strong as they used to be. But Leverkusen has improved greatly under their new coach Xabi Kompany. He has done great job making Leverkusen real challenger to Bayern. This makes league more exciting to watch. Hopefully Dortmund will bounce back and make competition even stronger.
Dortmund's last match against Stuttgart was beyond prediction. I think Dortmund played very poorly at that time. The strategy planned by the Dortmund coach did not go well. The record was finally broken after 4 matches.
It seems to make the reason for the fatigue is not right because these two teams are playing in Europe. Even Stuttgart has to play against Real Madrid. Nuri Sahin seems to have to immediately improve the mentality of Dortmund players if they want to enter the Eurozone for next season. It's only been 4 matches and it's not too late.
Stuttgart was a club that performed so well in the Bundesliga last season and came out second in the table so they are not just an ordinary club, besides they gave Real Madrid a tough game in the Champions League last week even though Madrid won at last so winning Dortmund should not be a surprise anymore. Fatigue really worried most of the players due to the Champions League games they played but since it was the both clubs that engaged in the champions league games, the side that played better actually won which is Vfb Stuttgart. Dortmund is one of the major teams in the German Bundesliga so their players are still very much in form and they can still improve more in their performance.