Young adult sci-fi. Haven't we have too many of those already? Well, the first episode of "The 100" shows that, if you do it well enough, a done-to-death idea can be fun enough.
Here we have all the ingredients of these kind of shows: 100 under eighteen people are sent back to Earth from a space station, after humanity had to run away (some kind of nuclear war). This 100 very mature and resourceful people (cough cough) include everyone in a 101 YA sci-fi: nerd guy, reckless girl, god-complex suffering guy, etc etc. You will know from second one who is going to get together with, and then who is going to split with to start a relationship with... The summon of originality. The group dynamics don't differ much from this idea: who is the leader, who wants to be the leader, who doesn't but will be...
But even if we have seen this a hundred (sorry?) times, the package is nice, the young actors do a good job, and the adults (which include people from "Lost", "Battlestar Galactica" and others) too, and it's always nice to have some dystopian series to watch, as it is easy on the eye and fast paced. And it may hold one or two cards up its sleeve yet.