Changing default color schemes will impact many other apps. It will take ages to trickle through to all the apps you use. It will not look better until it does. Thats the kind of UI change that is cost, and disputable benefit. I like it, but even if you don't like it, its not bad, technically, contrast etc. And you can change it. At your own cost instead of at the cost of a very large developer community. Personally I use Ubuntu fonts by choice outside of Ubuntu. Luv 'em.