I think most of the value of these sorts of things are that they are conducive to conversation and they can be pretty fun. Why wouldn't I want to know that my personality type is that I am a super awesome golden dragon or something awesome like that?

In terms of what they actually measure, I don't think they have much value as diagnostic tools for personality traits or really that they have any scientific merit at all. However, if you're just viewing them as a simple heuristic or fun way to broach a conversation about personality I don't see much harm.