well, the font *ought* to look that ugly, as that's a GTK 1.2 app, and GTK 1.2 apps don't support anti-aliased fonts. You're probably using the GIMP 1.2 as well, that's the GTK 1.2 version, if you want nice fonts (and nicer everything else), switch to 2.0, which you should find either in main or contrib depending on the MDK version you're using. If you're on quite an old version you may find GIMP 1.3 in contrib (1.3 was the development series for 2.0).