it was good but i felt like they crammed a little too much into the first episode.
i think it would have been better to build some suspense for a few episodes, and have people wondering whether the visitors are good or bad, what their motifs are, whether they can be trusted, etc... instead of revealing all that in the first episode.
i'm interested in the show and where it's going, but i just felt like they rushed into the plot a little.