Casshern Sins, Shinsekai yori Recommendations
Both of these show's clearly occupy their own niche, but they also have a similar feel. I guess they also have similar themes, similar pacing, and take place in a post-apocalyptic setting. They're also both really good.
Some other similarities:
Morality in shades of grey.
Inspired art+ character design.
Thought provoking without being overly deep.
While Casshern Sins is more Action oriented at points and Shinsekai Yori has nothing to do with robots, both give off the same mysterious feeling of what happened to the world in the past. Both are set in dystopian futures, and the art style is very similar.