The problem isn't KDE at all its the brand of kde. The kde integration is really a major distro's version only (SuSe, Mandrake etc). I was one of the testers of LO until I brought up both Trinity and Unity project (basically suggesting there were other distros and GUI other than ubuntu and gnome), after which I endured a 3 week flame fest.
I've test LO of many distros using kde3 and 4 both no integration. We should look at how Ark did its integration, as it was perfect (still works for me). Screenshot of OOo using kde's open save UI included.
I've also done a comparison between LO and OOo, and found that OOo is far better.