contend that a) it looks weird and b) it's not really an integrated application, but separate apps loosely bound in a flaky shell
first off, i completely agree based on what shipped with KDE 3.2. it was an early draft of a final product, something the developers themselves stressed. the fact it was already useful in this state is cool, but it's a lot firmer and better integrated in 3.3.
all the same, it brings up an interesting topic for discussion. people in the company i work for part of the week also noted that kontact "looked weird" though no one could really put their finger on WHAT it was. i'm going to proffer a guess:
pixels. stray pixels, to be exact.
things don't always line up perfectly, both between the button panel and the main app area or between the different apps. the toolbar buttons and the button panel don't line up. the button bar is very plain with an old-school sunken button look to show selection.
these aren't things that the developers probably should really be concerned about, though. aestheticians would probably be better candidates for smoothing out the UI. i wonder if there are day spas for software? i know there are a few KDE apps that could use a trip to one .... =-)