I actually liked the first part of the film. Gary, yes, many people will find the end of film unwatchable. There are images I wish I hadn't seen and could erase from my memory.
He's been writing "A brief chronicle of my attempt to finish my film in time for the Toronto Film Festival" at http://twitter.com/Jasonreitman It was finished Sept 2, but then Sept 3 he wrote the title company used drop shadows on the end credits, so he had to reshoot them.
You can watch it online (it this url doesn't work just do a google video search - it on YouTube a few times as well as DailyMotion) http://www.youtube.com/watch?v=f33Cs34GINs Though I imagine the version at Toronto will have english titles