I just got my new surface pro 2, and am puzzled by this problem. Many programs, including IE10, the modern interface (start screen), and Office 2013 render text perfectly fine. But R (an open source statistics program) does not. The text is very fuzzy.
I have R installed on multiple other Windows machines. It renders text perfectly fine on a desktop with Win7, a laptop with Win7, and another laptop with Win8. So this problem seems specific to the Surface.
Can you locate the exe file of R?
Then you can open the properies dialog of that exe file and see if you have a Compatibility property page. If yes, try to check "Disable display scaling on high DPI settings". Apply the changes and restart R. Is it still blurry?
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SvenC