Ok so, at this point, I've exported/imported in every way possible and I'm getting the exact same results.
Whether I export to fbx in revit, import revit link, by material, by family, as one entity, doesn't make any difference at all.
After import, when I open the material editor and select any object, it's "autodesk generic".
No mutli-subobject. If I select a window assembly and want to select only the glass, I cannot do it. Or can't figure out how.
At this point I'm thinking either I'm just not smart enough to figure this out or I have a twisted install.
Not understanding why I can't go into the layers palette and select Glass, and get the selection I'm after.