It has not been Borussia Dortmund's season. They have struggled in the German Bundesliga, where they are currently only in 10th place; they are unlikely to play Champions League next season, first time since 2011.
In the Champions league they have had some reason to forget their meager Bundesliga performance, as they won a group ahead of Arsenal, Anderlecht and Galatasaray. In the last-16 though, they have just been destroyed 0-3 at home by a Juventus side that has gotten a thorough revenge for their defeat against the Germans in the legendary 1997 Champions League final.
That said, such a thorough defeat at home can only mean that coach Jurgen Klopp, who has managed Borussia Dortmund since 2008 may be on his way out. It is a pity for a manager who has indeed given so much to Dortmund, but at the same time a club at this level cannot allow such results (considering that Schalke 04 and Bayer Leverkusen fell after fantastic matches, the Dortmund debacle seems so much worse!), and I am certain that Jurgen Klopp will have some excellent offers from other clubs.
It may be time for Mr. Klopp to leave.
In the meantime Juventus are the sole Italian representative in the quarterfinals, largely fruit of hard work, a deadly counter-attack and a splendid Carlos Tevez (who scored two and had one assist today).