Sound effects are only functionally good, in contrast to the excellent graphics. It is possible to tell which weapon is being fired by the sound alone, useful for those fight-or-flight decisions. Each merc has their own vocal samples and, although these are mostly gung-ho gibberish, they do add a little character to the game. There is the odd ambient-environment type noise too, like radios playing around people's houses and the waves gently lapping the beach.