Says who?
I heard from some friends that Nürnberg's christmas market is the most famous one in Europe with all the grandeur, etc stuff...! Its indeed splendid, but crowded as many folks come around to visit that as its famous.
But, some people like it and some dont (mostly because of the crowd)..So, it depends...and its probably worth it (specially for people from other countries)..! And i know many people from Nürnberg, who say that its great over there and its famous all over, but they dont really like to visit that often as its crowded and much touristic...!
Many of them, apart from visiting nuremberg, also like to go to some places nearby where it looks a bit medieval and also offers genuine stuff and looks traditional and orthodox...! I had been to one like that in a place called Spalt (not far from nuremberg) and it was indeed a good experience..not so big, not so small..!
Nürnberg is so famous for this, that its called "weihnachtstadt" ..!