I somewhat agree, but not because it's old. The Colt 1911-style pistol is older still, yet it remains one of the best pistols ever (IMHO).The Garand is an excellent rifle, that just happens to be 80 year old technology; so while it is a good rifle, it is now far outclassed by the new breed.
The Garand's two biggest drawbacks are weight and ammo capacity.
Its accuracy, however, is definitely not outclassed - equaled, maybe, but not outclassed.