While Unity has made every developers life easier, with not having to deal with the low-level optimizations and the very specific hardware configurations. Some developers revel in the challenges that a very difficult development environment provides.
A great rundown on security practices you can take to help protect your game from being modified (and even some tips to for those wishing to do the hacking).
The Blacksmith is a real-time rendered short film inspired by Old Norse mythology. Unity developed the filrm to try out the rendering capabilities of Unity 5
As a fan of Grand Theft Auto for the primary purpose of messing around in an open world. I am digging this prototype GIF a work in progress Fork Lift game.
In Unity5 the way shaders work have been massively overhauled. This video shows off some of the advantages to the new approach. Read this detailed guide to the new shaders.