Of course Dortmund shouldn't be on a relegation place. That is no question, and that's why everybody is shocked about that (even Thomas Müller according to Bild). But if we are honest and if we watch all games they played so far this season (not only the last one which was really bad), then we can easily say that they are still the 2nd best team in Germany in terms of quality and playstyle. But they fecked up too many results in ridicioulos ways (failing to score, couldn't break enemy's walls, poor individual mistakes in defense, bad day for the ref vs Paderborn for example etc.)
It's mostly their own fault that they are where they are now, but still they are a very strong side in my opinion and they will rise up again this season (probably too late for CL though).