Real world scale material previews too small
Real-world scale materials often show up at a very small scale in the material editor preview. This makes it very hard to create materials accurately. It would be nice if the scale of the preview ball/box/cylinder could be specified when working in real-world scale.
Andrew Roane commented
Thanks Peter, I never knew about that option. The same concept could be improved, though. This shouldn't be buried two-levels deep in the UI, and it would be helpful if each sample slot could have a unique render sample size.
In Revit and AutoCAD, we solved this issue by allowing arbitrary swatches that represent different object scales. In addition to the ball there is a wall, a vase and a couple more that a recognizeable and provide a sense of scale.
U can actually fix that pretty easy by changing the actual size of the material preview object (Render Sample Size) in the material editor/Options dialog.