As much as I hate to admit it, Mint 15 KDE has been a major disapointment for me. Nepomuk crashes constantly and I have many graphics problems. For example, I can play a few videos in one application, then if I try to play a video in another application, the file opens but the screen is black and I have to log out and back in again to watch it. I've tried opening a video file in SMPlayer, VLC, and Kaffeine... None of them work until I log out and back in again, then they all work again. This is just one of the many graphics problems I am experiencing. When trying to play audiobooks consisting of separate files for each chapter in Banshee or Amarok the files play out of sequence after the first few files have played. I've had to resort to using VLC for audiobooks. (I usually use Banshee for audiobooks because of its simplicity and bookmarking capability)
I am a sort of Linux newbie, but I've been playing with it on and off since the early 90s. I started using it more and more begining with Ubuntu 7.x. I started using it seriously with LM 12 KDE. Finally this past November, I made the big leap and switched my main laptop and netbook to LM13 KDE then upgraded them to LM 14 KDE. A few days ago after upgrading my LM 14 KDE to KDE 4.11 on my main system I couldn't login. Rsther than mess around with it I decided to do a fresh install of LM KDE 15 mainly because of its support for tablets. I've had one problem after another ever since. Tomorrow I am reinstalling LM 14 KDE and sticking with KDE 4.95. I absolutely love Linux Mint and KDE. LM KDE12-14 were great. I have a 3rd laptop for school which runs Windows 7 because I need MS Office. (I came across too many compatabilty problems between LibreOffice and MS Office) but LM KDE 15 really sucks!