XP had a nice look for when it first came out. Things change. Styles change.
It's called customization. Not everyone likes the same thing exactly how you like it. That's why they made it so you can change the colour of the themes.
Why do you think Firefox is so popular? One reason is because it's very customizable. See? you want the user to be happy. People are happy with customizing.
Actually, WindowBlinds know what they're doing. It's not even noticeable when your using it. It wasn't for XP. It wasn't for Vista. See the pattern?
I'm sure they will do a good job. So before you shoot it down, at least wait till you try it OR until it's finished.
Ignorance.