From a literary standpoint, the Book of Mormon is an abortion. I's poorly written in a shoddy pseudo-Shakespearean English, full of long, repetitive passages that add nothing to the narrative or theme of the stories. Its metaphors and symbolism are delivered crudely, often with extensive, unnecessary repetition. The author clearly did little to no research into the plausibility of the historical claims made in the book, marching it straight out of the "alternative history" category into straight up fantasy.
The ONLY excuse for setting it in the Americas was because the author was too lazy or inept to create a fantasy world from scratch or latch onto an existing fantasy world.
The we get into the obvious stupidity and incompetence of the characters depicted. None of the "heroes" are particularly intelligent or competent. Nephi for example, forgets the plates that are allegedly the family's most valuable possession, lucks into an opportunity to murder a drunk king, and then sneaks past guards who must have been as drunk as the king Nephi just murdered. Nephi is such an inept leader devoid of respect, that his brothers and sisters lash him to the mast of a sailing vessel so they can dance. Think about that scene for a second.
When they finally get to the new land, Nephi takes what was apparently a pagan ceremonial or ritual bow, whose real intention he would have known, and proceeds to break it while trying to use it for hunting. Does he then make a new bow so he can resume hunting? No. Lacking the wildness survival skills of the average boy scout, he and his family go hungry.
A movie adaptation of Nephi's life could justifiably have Nephi portrayed by Jim Carry performing the role as something between Ace Ventura Pet Detective and The Mask, but lacking any element of the competency, intelligence or self-respect possessed by either character.
There's a lot of good reasons Smith had to self-publish the book, and it's not just because he intended to use it to found a religion. If the volume is viewed as literature it's reduced to a footnote. It's a shoddy, derivative fantasy story based loosely upon Christian and Pagan mythology, notable largely for its obvious role as an inspiration behind the more absurd cosmology aspects of Scientology.