I've never been impressed with Glasgow one; suspect it won't be much this year, as they are rebuilding St Enoch Centre.
Problem is, it's not much like a German one, at all- there are a few stalls of German stuff, but not the lovely Kringel/ Lebkuchen/ wooden carved ornaments/ gluhwein that you would get in Germany. I bet all the "quality" stallholders are busy in Germany!