Quartz
Hero
It seems to me that the main problem with it is that it isn't used against players until they're high level. If it were used against them regularly (but infrequently) then they'd be used to it and have coping strategies. And 3rd Ed is much better than previous editions in that whereas in 2e, there were some monsters you couldn't hit without magic weapons, now it's simply DR, which a fighter can usually surpass. And the base material of the weapon is still important: a demagicked adamantine sword can still bypass a mage's stoneskin.