I disagree (On having the natural light be enough to fight semi-properly in anything but plain terrain).
The more you deviate from pitch-blackness the more natural differences in brightness settings will emerge. People have different light settings. This is a fact. They don't have to have them set "cheatingly high" for this to be a problem if one is trying to find the magic fine line where people can see a bit in the dark, but still feel they need to turn on the nightvision at times. I am 100% sure this problem (problem in that the difficulty for two players differ) exist today as well since we have maps that cycle from light to dark or dark to light. But since its a flowing shift everyone (except those with "cheatingly high" brightness) suffer through this magic sweet spot at one time or another, so we don't really notice this difference. If you on the other hand had the max darkness set to an attempt at this "sweet spot" you will have a bunch of people who never have to use their nightvision at all, and another bunch who are "on the verge" to see good enough so they simply adjust their brightness a bit so they don't have to bother with the nightvision (and thus switch to belonging to the first group of players who don't need to use nightvision at all).
A much better solution, in my not so humble opinion (I'm never wrong you see =P), is to keep the pitch-black episode and instead make searchlights a bit more useful. That way you have the game aspect where you really want to use nightvision to see, PPC can take this away from you but you are not totally left in the dark (oh I'm so funny at times...) since you have a searchlight that provides vision that is better then nothing but not as good as nightvision. Also everyone ("Cheatingly high" brightness again ignored) will get to play during the "sweet spot" (Although different setups will have this at a slightly different time in game) where you can sort of see enough without ANY aid, but want to turn on searchlight or nightvision at times.
/Merf - Hopefully managed to get a point across despite the horrid jokes
