Win XP with classic look was pretty decent and useable. There was an option in system settings to disable all theming, 3D stuff, animations etc. just the basic look of that time and a lot more snappy UX.
Do you have a picture of what that looked like? I'm curious. When I search for it, I can only find pictures of normal Windows XP and older versions of Windows. I can only imagine it looking like Windows 95 again.