So I have a character that I was hoping to make a Blue Mage when it came out, but I'm also interested in doing semi end-game stuff (not savage but at least recent dungeons and whatnot).

I'm looking at Black Mage and wondering if I should level it up. I like doing tons of damage and big explosions, but I want to learn a bit about the job itself first. Is it pretty fun to take into level 70 dungeons? Is it fairly straightforward to learn? I'd probably get a job boost for it, but I want to learn more about it first. Why do you love/hate it?