It is so KEY to understand that for a project to succeed… it doesn’t only rely on the shoulders of the manager, but also on the people concerned and the context of the project. The manager can be the greatest manager and leader. If the context of the project is corrupted and the people involved are not aligned, motivated and structured to deliver, the project cannot succeed.
So if you are a project manager, don’t always blame yourself. Take some distance and look at the big picture.
And if you are to evaluate a project manager, you should make sure you provide to him the right people and a healthy context in order to be sure that the project will succeed.