I have just left some feedback for a seller in which everything about the transaction was good. It was my full intention to leave 5 stars all across the board except for "Comms" which was greyed out. But here's the thing. I went from top to bottom, marking each one as a "5" but then I took my mouse pointer up to the top/right of the screen as a sort of guide when reading something (It's an OLD thing, :^O ) but then, as I took the mouse pointer back down to the bottom to the Leave Feedback button, it passed over the area that you click on to register your level of happiness re delivery time. The point being that even without clicking, the value dropped from 5 stars to 3. If I hadn't been alert the seller would have been marked down for no fault of his own.
So, just be careful out there.
Steve