Quick summary to start things off: this show takes place 15 years after the entire world loses power. Somehow physics stops working properly. No electricity, batteries, nothing. The country is now ruled by militias and one of them has come for the Dad (I never know anyone's name in pilots!) because they believe he knows how to bring back the power. He's killed, his Son is taken, and his daughter, Charlie, goes looking for her Uncle with her Step-mom and Google guy to save the Son.
From the pilot, a lot was established for this framework. We know that some people still have power, but keep it very hidden. We know that there is a dystopian militia ruled by the former friend of the Uncle, who I refer to as ER guy because I only recognized him as the playboy Australian doctor on "ER". However, given the wasteland that the country has become, there is a lot of play for singular stories of things and people they encounter, allowing the framework to stretch and grow before they ruin it by creating more mysteries.
The key to a show like this is all about the timing. You need to give enough answers to keep people hooked, but at the same time, you need to develop the mystery, or the plot, to keep people hooked. The reason I mention developing the plot is because I don't see how they can keep the mystery unsolved for more than three seasons without really creating a mess. That was the problem with "Lost". They refused to answer questions and it just became so confusing and convoluted that no answer made any sort of sense anymore. It was also the problem with "Heroes" where they answers too many things too soon and then had to come up with secondary plots that sucked. My ideal vision for this show would be for the world to somehow have power restored in three to four seasons and the rest of the series would be about the fall-out form having power back. That would work for me.
Anyway, I'm starting to babble. I would give this show an A-. I doubt it'll stay an A- for long, but I am quite looking forward to it, for now.