Possible spoiler alert! First let me say I really wanted to like this show.
Overall it was very well done. Episode 1 was put together well, good editing and a narrator who might have been chosen because he sounds a LOT like Mike Rowe. It flowed well and avoided the Chariot's-of-the-Gods style of asking questions and then suggesting, if true then...
Unfortunately it provided me with absolutely no new information, perhaps that's because I've already seen many similar shows covering the Battle of Los Angeles. If you know nothing about it, episode 1 covers the topic quite well.
I was going to rate it a 6 but, all things considered, it was very well done. Sadly I found it disappointing to discover nothing new, just a rehashing of old info, followed by a conclusion of inconclusive evidence.
If you haven't seen any UFO documentaries then I could recommend seeing this. If you are a hard core UFO enthusiast then pass - or watch it without getting your hopes up as it contains nothing new.