I've seen scrum work and not work. My biggest beef with scrum is that people think its a batteries included thing, and its not. I've also seen a lot of things

I've seen scrum work and not work. My biggest beef with scrum is that people think its a batteries included thing, and its not. I've also seen a lot of things called scrum, which were not scrum. That batteries not included part is the thing scrum calls a product owner, which is just an idealization of whatever requirements process is in place. If that requirements process does not deliver decent requirements in a prioritized manner, then good luck. I've had much more success with feature driven development (Coad).