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.

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. :)