No it really wasnt. Mobs actualy opposed threat. Then this uber entilted casuals came in complainig about it and Blizzard caved in in order to get their sub money. And in process of cuttering game for these so called casuals alianated rest of their core audience.
Yes mobs were not mechanicly challenging becouse you know 2004. But thats not excuse having world mobs with mechanics what hit like wet nuddle. Doing no dmg and dieing in 2 seconds. Its also reason btw why are zones over saturated by mobs. To compensate for fact game become easyer and faster.