How to defend badly graded master thesis? My master thesis was the greatest sh*tshow that ever happened in my life. Fortunately I did manage to put it all together and submit it. After that I booked a defense date which is tomorrow.
In the meantime, two days ago I got the reviews for my master thesis from both professors and I barely passed the written thesis with score of 3.7 (1-Excellent and 5-Fail) with a lot of questions about my approach and structure. I don't mind ending with a bad grade as it was not up to the quality. 

But, I am now in panic and anxiety for the last few days. I don't know how I will defend my thesis. Would anybody guide me how to defend a bad graded thesis? I am based in Germany. What are my chances that I failed the defense despite passing the written thesis?
My mind is blank at the moment due to anxiety as I did not get enough time to digest my results.
While I wish I could be more positive, the fundamental fact that is in the German grading system, a grade of 3,7 on a master's thesis is a disastrous grade that is essentially unheard of. Virtually all master's theses receive grades somewhere between 1,0 and 1,7. A grade of 3,7 is very much a "pity" grade that allows you to pass the master's program, but is essentially going to be an albatross around your neck. You will not be able to use the degree to pursue advanced study anywhere in Germany, and gaining employment with that kind of grade will be a lot more difficult.

You will want to check the Prüfungsordnungen (examination rules) for your program to determine if you are allowed to resubmit or repeat the master's thesis, rather than take a grade that low on the thesis. In that case, you may find that option preferable to having to deal with the consequences of a D on the thesis.