Not everyone can do David Mamet dialog. People, in his movies, don't speak like you or I. They speak in rhythms and use odd syntax and cliches that only Mamet knows.
Val Kilmer is one of those people who should not speak mimetic dialog.
Happily, Ed O'Neill and (of course) William H. Macy are quite suited to the task.
An otherwise entertaining movie, full of mimetic usual twists, albeit some of them a twist too many, and pessimistic worldview. Unfortunately the lead actor was not up to it.