There's too much wasted screen space - the main image is too big and the icons along the top of the screen are too big. I think 15-20% of the vertical screen space is wasted.
The top bar is not that usefull and in my opinion would be better as a sidebar.
What about that top bar that was supposed to integrate all KDE related sites?
The forum logo creates a lot of wasted space tat is added to the space taken by site global navigation, "Post Reply", etc.
The graphics need more contrast imo.They are to smooth. Oh! if I look in the bottom of the page I see that the layout is not correctly alligned. I mean that the lines make something like "----____----" instead of "------------".
Most of this things are probably related to the iCGstation template as I don't seem to be able to change it.
In general I think that usability was disregarded in consideration to preatiness...it's not preatty enough...
I find that KDE-Forum now looks better, but I agree with many of the earlier posters that it's a bad idea not to use the entire screen width. Another thing I dislike is that viewed and unviewed topics have the same color.