Some of the actors in the movies are totally nuts with absolutely no idea how to act, but some of the actors are good also. The beginning movie is 4 minutes and 28 seconds long, and really pumps you up for a good game. The briefing movies at the planning screen are better than regular word briefings, and they also provide tips and updates on the war. The sound effects are nothing spectacular, almost exactly the same as the previous games. You can hear where an opponent is, but there is no Doppler effect or anything else that makes the sound effects great.
Music is a different story though.
The score is fantastic, but most of the time it will be eclipsed by the loud sound effects. A problem with the game is the voice acting. I barely heard half of the words my lancemates were saying when I was playing, the audio quality of the conversations were so poor. The Gameplay is exceptional. The controls are very unique, as is the whole idea of piloting a Battlemech.