I started watching this as a mistake; a friend mentioned a show on Hulu that started with a "V" and I thought she said "Vanished". The first episodes were intriguing enough for me to continue even after I realized my mistake, especially with the allusions to a rogue sub-group of Freemasons.
From about the 5th episode on, I realized that the plot would not be able to continue without the utter naivete of the FBI and the utter ineptitude of the Freemasons. I won't give any spoilers, but the latter half of the season (and, necessarily, series) raises more questions than it answers. The ending is even less fulfilling than the ending of "Battlestar Galactica", a feat I once thought impossible.
I would not recommend this series to anyone.