The problem that I have with the material editor is that it's not easy to work on a project of any size due to the huge number of materials that get into the Material Editor once you've set up a project of any size. There is no way to drag and drop or otherwise organize it to let you work the part you need to work on. The stress of modifying materials during a deadline really sux!
When you import models either by copy and paste or import thru 3D Warehouse the number of materials shoot out of sight leaving you with a huge number of materials to weed thru. Purge unused material doesn't work well.
If you could organize it by drag and drop or isolate materials that belong to models you are working on it would cut down on the search for just one material. I have to isolate parts of a project in separate files and manually delete any extra materials then copy/paste it back together.
I wish there were a 3rd party plugin or that Google would invest a little in Sketchup. I still want to keep SU simple but just smoothed out in the Material Editor....
Thanks,
Gary