Tried out KDE 4.3.2 on the latest Ubuntu, and what occurs to me is "wow - that's bad". After the 4.0 release fiasco I thought they could only go uphill, so I was quite disappointed with the latest version. KDE has really gone downhill from 3.5.x. I think it should be seen as an example of how not to do things. It seems to have focused on eye candy at the expense of usability.
From a user perspective the ideal desktop should let you just get things done. A good desktop should let you configure things whichever way you like and then be 'invisible'. Unfortunately KDE does neither. It now constantly gets in the way. It hinders rather than facilitates:
Sad. I cannot recommend the latest KDE.