I think COH2 made a good effort in recording actual weapons and how they sound, without overly "enhancing" them to cinematic levels. Now, regarding the voice-overs, whoever cast those actors needs to be fired.
What's wrong with the voices? Is it because there are no macho hero army men like CoH1's VA?
CoH1's voices have a charm, but I prefer CoH2's because the vocals are more down to earth.