I have a 1.5 GHz, 10.9.2 with no blurry text. I do get a serious issue from time to time where the combat map doesn't render properly... either everything is white, or the map is partially showing, but then everything else is rendered as if they were redacted: covered in big black squares. Ive seen it on several maps now, but usually save and reloading makes it go away. Sometimes saving crashes the game as well.
Edit: I just noticed that there was a dedicated bug thread, and this is a known issue... my apologies!
I bought the game thinking that (I was desperate to get my fix!) and it worked.
