It's times like these when I wish The Vampire Diaries had a larger budget. While the flashbacks are nice and give some perspective, Rebekah having to narrate a majority of the story showed the clear limitations of what they could do. Imagine if, at the end of the episode, we see Klaus ripping the heart out of his mother's chest. Now that would be crazy. Furthermore, there wasn't even enough money to hire a language person, so we had to listen to Vikings speak English.
Even so, "Ordinary People" fills in the blanks of the vampires' origins--how they'd become vampires to fight off the werewolves, how Klaus's mother had an affair with a werewolf which resulted in his hybridation, her shunning of him which led to him killing her, and finally Klaus's deception, which, when revealed, leaves Rebekah in tears.
The only other plot in the episode was Stefan and Damon hanging out at a bar before Mikael talks to them about luring Klaus back to Mystic Falls. The episode ends with a sentiment that pushes Elena out of the picture: Stefan will saved himself not because of his love for Elena, but for Damon
History lesson of the week: Vikings had Hebrew names and drew cave paintings!