I see posts like yours from time to time and I have to read them about 3 times to check that you are talking about the D100.
On an average type of scene in average light I would say 99% of my d100 pictures are sharp and well exposed. On high contrast or difficult lighting then I would say 95% and usually I can get what I want with a few tweaks on exp comp or white balance adjustment.
You must have a problem with the camera or maybe it is due to the earlier f/w. I hope it gets sorted for you.