I agree that criticals seems to happen too often, I think that the aimed critical chance may need a reduction (consider that the aimed critical chance its ACC+CC, yes this if after divided by the CR, but still the final chance easyly reach 60-70%).
Also weapons drops shouldn't be that common, for a logical point of view, two handed weapons should have less chance to be dropped, and unarmed weapon (power fist, impact globes) should have a very small chance (or even none) to get dropped