kill.switch does a great job of establishing atmosphere. Backgrounds look good and set the tone for the level. This becomes even more impressive when you throw in an excellent lighting system, bullet tracers and map damage. Its neat to see all the different way the developers were able to work lighting effects into the game. As you storm bases you'll see flashing red lights highlighting everything in the area. When outdoors, both sun and lighting during a rain storm show up. Environments deform as the bullets fly, especially the areas you decide to take cover behind. What looks like a solid wall in the beginning of a fire fight isn't likely to look like one in the end. The character models show off some really nice details and animation.
For all the special effects and grandure, kill.switch has some noticeable problems that can't go overlooked. The texture work is subpar at best, even for a PS2 game (since the system is notorious for blurry, bland textures). The game also slows down when areas become too heavily populated. This puts a damper on the game's pacing. The biggest problem is the camera work -- which plays a big part in the game and can become a game killer at times. Depending on where you're taking cover, the camera will settle in on your character. Usually this isn't a problem, but there are times when you'll choose an area and the camera will get caught up on something, screwing up your aim and field of vision.
Sound is one of the more impressive aspects of kill.switch -- espeically if you have the benefit of a sound system hooked up to your PS2. Think about the best sound you've ever heard in a modern war movie, multiply it by ten and you're pretty close to how the game sounds. Hearing bullets wizz all around your head really pushes up the game's intensity level. Voice work is good, consisting mostly of chatter between characters. Much of the dialog is the macho bravado you'd expect to hear in a guy movie. kill.switch's soundtrack enhances the game's andrenaline inducing action. When the action is light (which is rare), a subtle theme plays. When things pick up, so does the soundtrack.