In the span of four hours, YouTuber evilmrfrank created a lovely desert scene using Epic's Unreal Engine 4. Luckily, the video he posted isn't four hours long.
Watch as he put together the scene with art assets from UDK.
Seeing the video reminds me of the engine's demonstration I saw at GDC 2013, which highlighted ease of use thanks in part to the various tools included and the ability to drag the assets around the project or insert anything from the menu.
Epic made it all sound so simple, and this video makes it seem that was as well.