I'm not sure where Willis falls for the blame in this.
He is credited as Executive Producer so that instantly gives him a good deal of power over all production decisions, I have heard rumblings that Skip Woods is a friend of his also.
In all honesty it just seems like Willis wanted a quick payday and Fox were happy to obliege him in that regard, cobbling together a less than stellar crew and hoping for the best.
According to what I read recently (in The I IIRC) the story idea for this was Willisí so heís even more culpable for the end result.
This is getting mauled. Havenít seen one good review for it yet.