I honestly cannot stand Michael Moore. The man is... indescribable (of course, by "indescribable" I mean "a lying, leftist, fatass of a douchebag"). On the other hand, JFK is one of my favorite movies of all time. Of course, that deals with stuff that happened almost 25 years before I was born. This will hit a little too close to home for me to get any entertainment value out of it.
By the way, how much fabrication was there in JFK's plot? And was RFK (the movie) a sequel?