It would be useful to know if the edges are anywhere near correct length in the UV editor.
For an example the area of 10x10 polygon is 100, but also 1x100 is 100.. and the Area Stretch would show both ways correctly sized. Of course if I know the polygon's size, then it's easy to have it correct size in UV map, but with more complicated models it gets very difficult.
Also it would be useful to know if the Stretch is too small or too big. Then perhaps it could be shown with this sort of colors: Blue = Small, Green = OK, Red = Big.