I also see blurry text and graphics in PowerBI Desktop. I noticed that it clears up if the mouse hovers over an area or a visualization is selected. This is pretty bad since it's a tool that focuses on delivering visualizations!
I was able to fix the blurry text and graphics in PowerBI Desktop by changing the anti-aliasing options to "off" in my 3D graphics options. In my case I used my Intel HD graphics control panel to set the 3D options for anti-aliasing. For those using a discrete graphics card you will need to find your anti-aliasing options.