I had a really tough time choosing what I wanted to run. I looked at a lot of desktop environments and a lot of different distributions. I could find things I liked and did not like about all of the environments I tried. Out of everything I tried I liked, Cinnamon and KDE were the best for me. Seeing all of the right click options in Dolphin installed by default in Mint 14 KDE really got me to take a closer look at it. The way compositing worked in KDE was also a deciding factor for me. I really liked how I could configure compositing exactly how I wanted. The Mint KDE edition did not seem cartoonish like Linus described either. Fedora had a cartoonish look but the Mint release used a nicer set of default icons and in my opinion it gave it a more professional look.
Memory use really surprised me too, I expected to see much higher memory use but I have been reading that the KDE developers have been working to reduce the memory footprint to get KDE working on other devices. Memory use in KDE is no worse than Gnome Shell or Unity, Cinnamon used less system resources tough. There were lots of little conveniences built in to the Mint KDE edition by default, it does make things very pleasant to me.
With KDE I always seemed to have some odd errors and quirks but I am not finding any with KDE 4.9.4, it just works. This release has really changed my views on KDE. Some of this might be because KDE 4 has had a lot of time to mature where many of the other desktop environments are still a work in progress. Cinnamon has matured faster than any of the other newer desktop environments in my opinion, it is very quickly becoming feature rich and complete.
Unity is not bad but I worry that it is getting too commercial. I am seeing too many things in Unity that I want to turn off and the interface gets boring after a while because of the lack of customization it has. Light DM used to be nice but now there are so many things hard coded into it that it has become a real pain to work with. Now you have to use configuration tools to make changes to Unity or use tweak tools and it is getting too much like editing the registry in Windows. Gnome Shell is configurable but it takes time to get and set all of the extensions to make things the way you want them in the first place.
After seeing peoples reactions to Windows 8 and the newer desktop environments in Linux I have to wonder if a traditional desktop with more modern features isn't a better idea. Why take away the things that people really want and use? Cinnamon and KDE have all of the things that people seem to really want out of the box and have the modern look that many of us enjoy. I never imagined that choosing the right desktop environment could be so challenging!






