KDE has been my preferred desktop environment since I started playing with linux sometime in the KDE 3 days.

I'm glad the wobbly windows desktop effect has stuck around too: absolutely unnecessary, but it's silly and fun.

My biggest complaint has nothing to do with KDE itself, but the fact that GTK apps are so ugly by default. QT apps look fine in GTK desktop environments though. (At least KDE has easy built-in settings for handling GTK theming these days...I remember it being more of an issue a while back)