Even Archers who do huge damage, are techically hitting with the main arrow and a concussion special, and then maybe the hit spell. Even though these hit at one time, they can be defended against by having parry or DCI. Also the Archer has way less mana than a GD, so if they fail to get the kill they are in a lot of trouble and usualy end up running away.
OK dude.. in all seriousness, now.
you have established that other templates are able to combine moves to create a one hit devastating punch. Much like gd's attack. That is cool. You didn't address why you can't withdraw from a greater. (there is a bug re: hitting targets from multi screens away.. but let's assume that bug has been corrected).
You can't stand toe to toe and take on a greater dragon.. nor should you be able to... It's an uber pet. It isn't all powerful end all be all. It has weakness which can be exploited. If it had no weaknesses, it if had no way to be defeated then yeah.. we should nerf it to hell and back. But that is not the case.
Again and again it has been shown you can defeat a greater with the right tactics, template, and abilities.
All that is left is for tamer/gd haters to yell about the amount of damage a gd does. Since there are other methods to do the same amount of damage, one has to wonder why some peeps continue to cry about greater's.
This is something I hope the devs think long and hard about before taking any action on the greaters.