If we used Unicode stars we would lose the ability to round the rating to the nearest half star, because Unicode doesn't have a half-star character.
I see two ways to make the current stars clearer: reduce the thickness of the outline, and draw unfilled stars (and the unfilled part of half-stars) in a faint grey rather than yellow. Either would help; I think both would be ideal.
The review submission dialog stars should be drawn differently anyway, to fix bug 770963.
If we used Unicode stars we would lose the ability to round the rating to the nearest half star, because Unicode doesn't have a half-star character.
I see two ways to make the current stars clearer: reduce the thickness of the outline, and draw unfilled stars (and the unfilled part of half-stars) in a faint grey rather than yellow. Either would help; I think both would be ideal.
The review submission dialog stars should be drawn differently anyway, to fix bug 770963.