"With regards to the Pet Peeves area SPOILERS AHOY: It's not a yo-yo where they came to Earth then left then came back again. The Earth of their myths and the one that they came from was the battered, post nuclear world they landed on at the end of season 3. The one they ended up on at the end (our Earth) was not the same planet, they just called it that because it's a nice place and why not? The implication is that humans must evolve again and again throughout the galaxy (since there were humans on our Earth already when they landed) and the same shit always happens. But it ends on a hopeful note that maybe this time it'll all turn out different because we have cylons baked into our DNA, so maybe we won't treat them like shit when we create them and cause them to rebel and genocide ensues. It's still a tough pill to swallow and there's still a lot of other huge problems with the finale, but it's not quite as bad as what you imply here." - Eric P