The fatal flaw
The production value was excellent. Solid characters and some engaging stories. The problem was the series couldn't make up it's mind that the invaders were good or bad.
It's a massive flaw because by their nature the invaders killed the person they were cloning. It's a very bad thing but some of the characters try to stay neutral. At least in "Invasion of the Body Snatchers" we had clear right and wrong. This came off as wrong may be for our own good.
I love the series but I do think that was a fatal point of confusion. You don't have a clear side to support even though the invaders are killing people. There needed to be a clear fight against the take over.
It's too bad because they had fun stuff planned for season 2 but we'll never know what it might have been.