I would like to start out by saying that the first "review quote" atop of this poster is completely incorrect. This movie will not sit with you long after you've left the theater however, the second is very true. The entire movie is a natural collection of father and son moments....why? Because Isaac in the movie is Mark's real life son.
I understand that the film was trying to convey accepting death and moving forward however I don't think Mark knew exactly how to execute that without being blatant which is exactly what happens towards the end with the goldfish.
What Mark has done is make a movie about his life with a few situations distorted (his wife is not dead, they are separated). After watching the film, I knew Isaac had to be his son because there was no way a child that young could give such a raw and real performance. Sure enough, Mark had a friend follow them around with a camera, the kid never knew he was making a movie, which adds to it's realism. What we get is a natural father/son relationship that I don't think can be duplicated.
The main problem lies in the story/plot, it's pretty much MIA. Mark has no money and can't get any gigs (insert cameo here by actor playing him/her self), is alone, "struggling" to take care of Isaac and trying to fill the void of his passed girlfriend with Shannyn Sossaman and some Jocelyn chick. I kept thinking throughout the movie, "why doesn't get a JOB while he tries to book a gig?"
Aside from the lack thereof of a good plot, it will be intriguing to see what Mark comes up with next, albeit he doesn't base another movie on his personal life.