It's WAR, and as such it should be gloomy! If you look under the options in game, adjust the gloomy - cheery slider.
If you turn cheery all the way up you will see pretty flowers and butterfly's on your low passes. Also I think you'll get a smiley face on your gun sight. I keep gloomy turned all the way up, just my personal preference.
~kc
Having fought in actual combat for 18 months, I know what a war zone is like first hand. It was never as dark as is portrayed within the arena. I can understand the author wishing to instill a sense of gloom , a dark foreboding, however, I think they have moved to fare in that direction. On my worst day in combat it was bright & sunny, perfect summer day for Vietnam It was 8AM, 90 degrees, 90 percent humidity . As you looked up that hillside you could make out all the hundreds of fighting positions they had dug in, the neatly lined sandbags, you could see the grenades as they bounced down the hill. You had no trouble seeing the rounds impact all around you. When they stopped rolling down the grenades, it wasn’t because they were out, it just meant you had reached spider hole country. When they popped out and thrust at you with their bayonet or slashed at you with a machete, you could see them clear as day.