Agile, as implemented in every big company that I've worked for, was a lie.

It was really telling at a smaller company that was trying to behave like a big company. I asked a coworker (who had great metrics) what the secret was for dealing with the middle-management-heavy and quite dysfunctional environment. He told me how he did it. Paraphrased: "It's easy. During each sprint, I work on the next sprint's work. Once it's complete I'll know how to make sure things match the work that's already been done and that way its always a bullseye and on time - because the work is already done.". Agile at that company was a joke to the people who got things done, and was a weapon used against people who didn't realise it in time. It sure generated a lot of metrics and stats though. I used to joke amongst coworkers that the company produced metrics, not products.