I enjoyed it. The flashbacks weren't so challenging that the average viewer would have trouble following it, and they set up a complicated plotline as well as could be hoped in an hour. I like the characters and am intrigued by the directions they can go. Pilot episodes can be hit or miss; there's a lot of stuff to get crammed in there. I thought FF did a pretty good job of introducing the characters, but the plotline didn't get off the ground quickly enough. This show is trying to do both.
Yes, it's sci-fi. Hot damn!
My guess at this early point is we've discovered either alien technology here on earth or the aliens themselves. Some cabal of powerful people has mucked things up and are trying to control it for themselves, either for power or money or both. It's a paradigm shift for mankind if word gets out and those things can go either way. Prudent course is to keep it buttoned up for now. Just like they've been doing out at Area 51.
I mean really, how can you blame them? If I was the first Hispanic President (Blair Underwood? Really? Jimmy Smits wasn't available because of that new law show?), I'd want to know too, dadgumit!
Anyway, they've already sold the show in 200 international markets so they're going to give it a good bit of latitude to stick around and develop. The worries:
a) They lose tons of viewers after the first few weeks.
b) Fox's competing time-slot serial 'Lone Star' is chosen by the viewers as their long-form fix instead.