To me at least, Windowblinds never did Windows 7 any favors either since you can't skin everything 100%. No matter what the theme, it just never seems complete. That is no fault of Stardock or those that make Windowblind skins. Just the way it is. MS did an excellent job with the default Aero theme and I've never experienced an "Ick" factor with it.
I haven't kept it on my system for any longer than a few days since Windows 7 came out.
Really, what is the need for Windowblinds on 8? You don't have the standard Start menu any longer.
Start8, while nice, is really just a crutch to get you over an initial discomfort. Once I got used to the new methods I can navigate around 8 and my programs faster than I did with the legacy start menu.
If Windowblinds for Win8 will let you change the Start Menu background and change the look of the tiles (without breaking the live tiles) then it may be worth something. Otherwise, to me, the new look grew on me and I have no problems with it at all. When I'm running programs I'm not looking at my Start menu and tiles anyway.