Some of the failure I've seen can be partly explained by people who wanted to have their cake and eat it. Who wanted, say, the promised advantages of Scrum but were not willing to pay its costs (lack of long-term plans and fixed finish dates).
That's not all. It's part of the explanation for some of the suckage I've experienced.
I do blame people for not making up their minds. The people who invented scrum were willing to give up some parts of long-term planning, and got remarkable results for that. They are not to blame when others later failed by not giving up blah.
Maybe some blame should go to conslutants who oversold the benefits of Methodologies without stressing the costs. "YES YOU ACTUALLY HAVE TO DO THIS, IT WILL WORK BADLY OTHERWISE".
