Its very typical in FOSS to think UI design goes no further than the 'doorknob' level. That's a big part of the problem right there. Y'all don't get it.
I do 'like' KDE. But as a SuSE and Xandros veteran, I can say that the more finely you tune the surface looks to Windows, the more the user will later feel dismay when they should have their curiosity piqued instead. The default KDE look isn't too bad in that regard.
The irony here is that KDE also lets you get closer to OS X look and behavior than Gnome will. Unity, however, comes pretty close in its default config.
What makes Unity a better OSX than heavily tweaked KDE is at being Windows-like is that Canonical actually does pay close attention to how well these cutesy graphical details line up with the vertical integrations they provide (and with each other). Xandros (around versions 3/4) could probably lay claim to an equivalent level of excellence, except that was achieved with a bunch of proprietary components.