Aliens: Colonial Marines is a squad-based first-person shooter in which the player controls four Colonial Marines, each with a different personality and primary weapon. Each player character can carry additional weapons including a flamethrower, pulse rifle, smartgun, pistol, RPG, and many types of grenades. The player controls one marine at a time, issues orders to the others using context-sensitive commands, and may switch between characters at any time.
So, what does this mod actually do? Well, it changes the alien and human AI (increases the size they have on your computer to process their actions), the time bodies are shown on the map (they now last longer), the effect when aliens are killed (they now break apart and litter areas with their body parts), all resoultions have been pushed to max, ambient occulsion has been enabled, depth of field and motion blur has been enabled, startup logos have been removed, film grain is disabled, all textures are on max except for shadows. Plus even more... Let me know what you think in the comments!