>Biographers and critics have disagreed whether these years in Jung's life should be seen as "a creative illness", a period of introspection, a psychotic break, or simply madness.
Which makes me wonder about the context of what you heard in school. By that I mean people seem to agree that what Jung wrote makes sense to a lot of people, so there's something of worth in there. What it doesn't make it is scientific. There's not a lot of people currently arriving at the same conclusions as Jung.
I'll admit I don't know anything about psychology (just what I've heard second hand), but I do find people like Jung quite interesting.