I read these replies with interest. I do hope you get a good camera back Brad because as I said before, my D100 is very accurate.
I can't help thinking that if there is a consistent underexposure issue then there must be a metering problem, seperate from the fact that it is a digital camera. Ben even says he uses an off camera meter with the D100. This is crazy. A D100 should be more than capable of automatically metering the vast majority of scenes with it's data bank of 30k images. I find that matrix and centre weight give the results I expect. Thats not to say that I don't adjust exposure some times and this is no different to bracketing. In tricky situations, the camera will err on under rather than over exposure but this is a major plus. It doesn't take hours of post processing, it takes seconds and you don't want blown out highlights.
On sunday, I took 119 NEF shots. I ended up with 14 that I wanted to keep. Of those I post adjusted exposure and WB on 4 of them. Of those 4 I had one that I wanted to keep but the original pic was poor (my fault) and spent about 10 mins on trying to get it as good as poss.
Of the 3 that I have sold so far they were all straight out of the camera with no adjustment.
If there is anyone in the UK with a problem D100, I'm up for a meeting so that we can do some side by side comparisons. This would be an interesting excercise for all of us and Nikon. Let me know.