Well, I have a 22 inch screen with the same high resolution as yours and the 100% DPI setting seems fine for me. There are so many users complaining about this issue, it's not just me. Perhaps the final display result is different on different monitors, that's maybe why we didn't agree on the image you posted - I thought Chrome rendered fonts ok while IE not.
You're right about IE grabbing Window's settings, but: (a) 150% is not the default setting in Windows (b) it does not explain the blurriness, since text of the same size appears fine on the competitive browser and on IE's own menus.
Anyway, I'll live with it! ;-) Probably going to stick to Chrome until further notice...