If you haven't been following the show, at the end of last season the humans found a habitable planet, dubbed it New Caprica, and settled. A year later, the Cylons show up and take over.
Tonight, we find out how the occupation has been going. WARNING: spoilers after the cut.
The Cylon ministries of New Caprica are faceless, inefficient bureaucracies. The humans live in squalor. The Cylons vastly outgun the humans, in a head-to-head fight the humans lose every time.
The Cylons arrest people without charge, and torture them for information. They've recently formed a police force of humans in order to try to win hearts and minds of the people. They play all sorts of head games with the humans to try to persuade them to join. And the Cylons are corrupt - we see one sleeping with a human in exchange for letting her husband out of prison.
The humans have formed an insurgency. They attack the "police" as collaborators. They bomb and attack where they can. They even resort to suicide bombings out of desperation.
Battlestar Galactica has done a frackin' metaphor for Iraq, and guess who the Cylons are?
This is just brilliant television. I suppose it's a good thing the right wing is too busy protecting sexual predators to watch.