The garbage world concept has been proven to be popular.
Screen shots from Wall-E :
Notice that it creates a different special feeling than any other world environment. A garbage world creates a sense of mystery, peaceful, and a "I can hack care of everything in it' feel. You don't have to pay attention to any garbage in it. They are all broken anyway. You can just relax and enjoy the fantasy world!
Will you still watch Wall-E if all you can only see will be the following background throughout the movie?
Here are other examples of a Garbage world : Final Fantasy, Fallout, Half Life 2, World of Warcraft, Dragon Ball, and many others.
It's strange isn't it? The best design is something with lots of details, yet something that nobody wants to care about.