One thing I love are sci-fi stories that take the human aspect and place them as rare/limited within the world that it sets up.
Farscape is an example of this. A lone astronaut taken far away and having to survive amongst nothing but alien species.
Most sci fi (shows at least) it's always a bunch of humans at the forefront and a few aliens here and there.
Colony ships are another aspect I like, drifting through space searching the unknown looking for a place to finally call home over many generations. To me this is how we are going to eventually leave earth Not on some super "warp drive" space ship that can take us to the nearest planet in a few seconds, but rather a giant ship that will hold thousands of people and have to make it an own ecosystem that we can survive on for hundreds and hundreds of years as we drift through space looking for a new planet to call home.
That's why I enjoyed Ascension and was looking forward to more, but sadly it never got picked up.
http://www.imdb.com/title/tt3696720/?ref_=nm_flmg_act_15