All I can say after watching the DVDs of the first season is that I can not believe NBC "green-lighted" this show. It's so different than what's currently in vogue save for Lost. Those who miss the X-Files just may have a worthy successor. Not as mysterious or intense as Lost, I find it to be overall more entertaining.
This kind of extended story is hard to make. I mean it could degenerate into childish dribble if most of the elements do not cohere together. But cohere they do and I think the cast is excellent, the writing sharp, the location and props first rate, and the special effects very good for a television budget. Sure it pushes what is plausible, but as it does it never gets so silly as to insult your intelligence.
Bottomline is that this is great Sci-Fi drama for the entire family. I doubt it will be a classic with a long run like X-Files, but in the meantime I recommend getting the DVD if you missed it like I did the first time around. This fall my must see shows has just increased by one more series!
PS: I just heard it got axed from NBC...Here's hoping Sci-Fi picks it up.