Breeze is light years ahead of Oxygen (or whatever the default theme on KDE 4 was called), but I cannot shake the feeling that it will be replaced with something else before it is done being polished. KDE doesn't seem to like stability.
I hope they don't polish too much. The already polished the circle from the X-Button on the title bar away. Which is no improvement.
Besides that KDE is fuckin' great, imo.
It's super objective for me, and hard to explain, if not impossible. I do recognize KFE's qualities and I have no real criticism of it, frankly, it's this difference between qt and gtk that I can't properly explain. :)