Re: 3 MR questions
1) Exposure control use the mr Photographic control for best results,
2) Sounds like you have turned the max reflection down to 0. Increse this. Often if you are not seeing the backround it is better to leave it black. If you are seeing it then use the mr physical sky shader
3)the polished metal preset is too grainy, either use fast interpolate reflections, turn up the glossie reflection samples and remove any bump map.
For a full explination on the A&D shader it is best to read the PDF in the help folder. It's full of information, not just on the shader but also other considerations that need to taken when doing physically correct rendering.
Also I suggest running through the mr tutorials that ship with Max, they will get you going very quickly.
jhv
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