If one is going to rely on the realism argument, it should be noted that when we're near the lunar minimum the game is extremely unrealistically dark at night. I don't know how many of you have experience living far away from civilization, but your night vision becomes quite considerable after a little time in the darkness, and even on a moon-less night starlight makes seeing fairly easy if there isn't any bright ambient light (nearby city) to prevent your eyes from adjusting. Perhaps a fair compromise would be gradually decreasing the darkness the longer you go without seeing anything bright (flares, chemlights, muzzle flashes, etc) and setting the maximum darkness to be a bit lower so night is generally more realistic. I'm not asking to be able to see as well as you can during the day (although again if you're outside at night for a few hours, the difference isn't as huge as you might imagine), but the absolute blackness you experience without using a light source now is quite ridiculous.