I'm pretty sure that the primary reason for Safari on Windows is for iPhone development & compatibility. From that standpoint, they have to include OS X's font rendering, since that's what the iPhone uses, and you want to see how your web app will actually look.
Well, you call Safaris text rendering fuzzy, I call Windows text rendering jaggy.
I'm pretty sure Safari for Windows will be a hit
Beta should mean it's in its final stages of testing. This has so many issues, they shouldn't have pushed this out as it is... If they'd actually done some thourough internal testing, they would have known this.