Basically the movie is about an "idiot dealing with idiots" in terms of little league parents. The story starts of slowly to allow for character development and setting up a good plot. Overall everything breaks down, it has little humor, and you are meant to identify with the supposed intellect of Max (Jeff Garlin).
The relationship between the father and the son is the only interesting aspect to this movie, because it has multiple levels to it, and tries to develop something inspirational and thoughtful out of it. Also they have Timothy Olyphant, so, can't lose there. J.B. Smoove and Fred Willard added something to the story as well, and that was entertaining. On the other hand, the storyline doesn't really do much to develop what could have been interesting. It ends abruptly, with little explanation or conclusive aspect.
The after-credits scene was alright, but again could have definitely been developed better.
Overall, the movie is a 5/10, on average would be between 4-6 depending on a person's taste. If you're bored, and are looking for a slow paced comedy (there are some chuckle scenes, and one or two funny moments) with suggestive humor rather than explicit, you might want to check it out. The movie isn't badly written or directed, but is not too appealing. Wouldn't recommend it to most people.