How do judge the quality of your own PhD? I'm close to finishing my PhD and I'd like to evaluate the quality of my PhD. I'm doing my PhD in the field of software engineering at a Central European university. My PhD thesis consists of published conference papers and a synopsis. I first-authored two papers in the top conference of my field and I also had a few other papers.

The problem now is that I'm unsure how good of a PhD this actually is. My PhD thesis gets graded, but I noticed that every PhD student gets something between the very best and the second best grade, independent of the quality of his/her work.

If I can't rely on the grade, and if I can't compare the number of publications to other PhDs, how can I best and honestly assess the quality of my own PhD?
You can't.

Probably this is a bit strong, but I think that in general you can not grade or judge your own thesis or assess its quality in any way. You are hopefully very critical with yourself and this is good. Your advisor and others referees for your thesis can and will grade your thesis and should provide a report which you may be able to read (depending on the local regulations) . If you need a more detailed feedback, ask these people some time after your defense (not directly after your defense - after passing it's time to party...).