I am not a magnum hater either! But once I was cured of "Magnumitis," I realized that for deer sized game, a .243 or 25-06 kills 'em just as dead, just as fastas a Super-Duper- Whopper-Stopper-Magnum!
It has nothing to do with meat damage, as Eldeguello said a well placed magnum shot won't ruin any more meat than a standard caliber.
With the cost of ammo, recoil, and given that MOST people shoot better with lighter calibers, there really is such a thing as "overkill!"