I think the problem with the font rendering in this screenshot is the hinting. When you hint the fonts too strongly they lose their character and the diagonals' width becomes inconsistent with the straight lines' width, as you can see in the lowercase 'w', for example. If this uses the FreeType library, you can set the font hinting to 'Slight' or 'Medium' and fonts look a lot better.

http://www.antigrain.com/research/font_rasterization/index.h...