Apparently, many decades ago, a group of pioneers left our solar system and set out to found a new colony. 'Terra Nova' was a failed experiment and Earth lost contact with them. Enterprise is thrilled when they discover the place--but it ain't what they expected! It turns out that the colony was practically wiped out and what remained went underground.
So far, this all was interesting and had the makings of a cool episode. Unfortunately, what follows seemed kind of dumb and didn't make a lot of sense. It turns out that the descendants of the colonists are amazingly stupid. They THINK that they aren't human and they think humans caused their catastrophe and since then they created some weird primitive tribal society. The problem is that they are also very suspicious and have taken one of the crew prisoner. What's next?
My problem is that to see a group of reasonable and intelligent colonists creating a new generation of folks who VERY quickly forgot they were human and created such a complex alien society made little sense. 73 years and this? It just seemed that such a plot MIGHT have made sense after 1000 years but not 73. Additionally, how did these people ALSO become so annoying and stupid as well?!