Well, druids sucking is besides the point. Sure, they're going to be suckier if they don't get the spell and strat upgrades that other classes get.
Nobody disputes that druids are a jack-of-all-trades utility class, for the most part. But they're fun to solo because of that and quad-kiting was a fun thing to do from time to time.
The other impediments to quad-kiting are summoning mobs and, to some extent, caster mobs. These are also potential impediments to swarming and decapitation/headshotting strats. But the devs presumably intentionally have designed certain mob populations in certain zones NOT to have summoners and few, if any, casters. The only problem I see in those zones SOMETIMES are named mobs popping in a mob group, which can mess up a zerker or sk's day.
My humble suggestion, sure to be ignored by the powers at Sony (especially posted on this site, for obvious reasons) is if you're going to allow certain classes to slaughter dozens to hundreds of mobs all at one time, GIVE DRUIDS UPDATED QUAD-KITING AOE DD's! LOL