This is going to be shorter than usual for me. I tried Ubuntu Unity, Cinnamon, GNOME, KDE, and Enlightenment E17 desktop environments and I have to say that they all cater to slightly different users with specific needs. Ubuntu Unity is the dumbed down version of Ubuntu made for the masses. It is supposed to look and feel like Apple Macintosh OS X. I don't agree with the future direction that Canonical is taking Unity, but I have to give them credit for their efforts. So far, it has driven more people away from Ubuntu than drawn them to it. Cinnamon is very nice. It's an old fashioned DE, but it is under heavy development. Things do break and it isn't pretty to discover why or how to solve it. Right now, Cinnamon 1.6.0 is not working for me and I can't use it. GNOME is good, but the need to use hot corners and the annoying system notifications alerts irk me. It takes me more time to scroll through my list of installed software applications than using GNOME itself. KDE is almost just right. I found that it makes the least worst compromises of them all, but the KWallet and screen blanking problems are annoying. They force me to suspend my System76 PC and resume it from suspension all of the time. Enlightenment is a little too plain. It is not intuitive and there is a lot of mouse clicking and scrolling needed to use it. I rarely use it anymore.
None of them are perfect. However, I found that using Ubuntu Unity is the best compromise so far because it is tested to work with almost everything. It is not that pretty and it's rather constrained and limited, but it works if you believe that Canonical is taking the necessary steps to increase the number of Ubuntu powered PCs shipped worldwide in the next two years.
There you have it.