Absolutely amazing. A great leap forward for science fiction. The only thing wrong with it is that it's not longer; however, thankfully Netflix allowed them to finish off their story and it is a well-rounded and complete show. The best way I can describe it is as if world music was a tv show. Not only are all the characters from all around the world, but also the filmmakers made sure that their segments felt like the media that would come from that part of the world.
It might be the seminal sci-fi show of it's decade. I cannot gush enough about it. I can only hope that more mainstream sci-fi can begin to move in the directions that it went in.