If the script did not try to homogenize such a disturbing story with comedic elements, it would function as the portrait of a disillusioned middle aged man who sees his better self in another man, and being frustrated at not being able to be him, eventually decides the only way to continue is by killing him.
I consider that possibility and tremble at what a fantastic dark drama that would have been.
But even if it had forgone drama and simply focused on being a comedy, this would have worked. One has but to look at Richard Linklater’s Bernie, a comedy which also starred Jack Black, to understand how successful this would have been had it followed that template.
Yet as it stands, it is neither here nor there, which is really too bad because barring the disastrous 20 final minutes, this flick showed potential.