It was honest of them to admit that the ending wasn't great, because it wasn't. Overall I liked it, but it was a bit similar to Adaptation which was made 4 years prior. I don't seem to be the only one who thinks this. Rotten Tomatoes' consensus calls it "Charlie Kaufman-lite".
Edit: the more i think about this movie the less I like it. Why was it more important to write a good ending for the book than save the guy's life? That doesn't make sense at all. FAJW0923J09F23J09