I didn't think much of the outcome of the quiz. I answered honestly, and was assigned "Dragon Slayer" (interestingly, like the author of this post). I plausibly recognized myself in most of the descriptions. Then I clicked on the "random" button, and read another breakdown of another personality type. I plausibly recognized myself in most of those descriptions, too.
I think this trades on the technique that makes horoscopes and tarot readings attractive: write gnomically, and positively, and your audience will fill in enough blanks to make anything plausibly applicable to themselves.
But, maybe that's just my analytical Dragon Slayer archetype talking. :-)
I'm happy for anyone who derives psychologically-useful insights out of this framework.