....or obscure mostly because I can't think of any other term for them and I'm used to it. But I agree with you.
Of course I know what you meant. Most of them got plenty of regular play until the Harras era, and even then reared their heads time and again. It was JQ and crew that dispensed them to oblivion. But even the Harras era went ahead and created scores of new characters, something not exactly happening now.
Diablo, for instance, has great potential. What was done with Annihilus could be done with him.