I really think the show has gotten better from the last episode of the first half of season 2 onward. For some reason I was under the impression that everyone would turn into a walker after they died, not just those that were bit/scratched. What I am surprised at is how fast people were turning into walkers after they died in the last episode. It seemed like in season 1 that people were laying there dead for quite a while before they were reanimated.