The sayings are a bit repetitious, but sometimes humorous. I especially enjoyed the music. There are only about five music tracks which cycle throughout the game, but they are definitely NOT muzak as the writer earlier mentioned. I find them to be very cinematic-quality scores, which really fit the atmosphere. Only aspect of sound that really needs work would be to add more variety to atmospheric noise.
Voices are okay, though too repetitive, and music is just fine.
Guns and explosions are decent, nothing special. I recommend this game only for those tactical turn game lovers who miss X-COM, but I advice it's far away from the other. It was desesperately slow for my computer. Shots take its time to arrive to the target who falls to the floor carefully slow. I specialy miss any type of campaign management.