Okay, so the fairly subtle hints of a previous age of technology on the world of Shannara turned into a fully fledged ruined city and a civilisation probably destroyed by nuclear war - presumably the races of elves, gnomes, trolls etc. began as mutated humans.
And our heroes stumble upon a place called Utopia, where humans are preserving what they can of ancient technology, such as the ability to produce electricity. The scene where they showed film clips of Star Trek: The Motion Picture was hilarious! Of course, any place like that, seemingly so perfect on the surface, must be hiding a Dark Secret.... (I was reminded of that vacation planet at the beginning of the original Battlestar Galactica, for instance).
On the whole, the series was fun, with a twist I wasn't expecting at the end, and with a few loose ends left should they ever want to do a second season.