^ That was my inclination as well. Yet even with hardcore, I was always too picky. DRI (and similar) shows were a blast though. Sabbath, Motorhead, and Venom (oddly enough) were the three who emphatically made the "metal" cut.
In any case, there's a lot of stuff in, as you said, a big, diverse, and overcrowded genre. Some interesting bands though, like Obsequiae, Summoning, and such. A guitarist I played with for years was into black metal and related sub-genres. It occasionally bled over into our music, which I wasn't pleased with. That was pretty much the context I knew it from. Distance can be a good thing, and it's fun to check it out on its own merit.