Dylan is a word slinger to be, maybe a genuine poet during some parts of his oeuvre. Still, he is not a writer, not as we understand the word, a craftsman, an artist, a professional of expressions, instructional or artistic, who crafts sentences that start someplace and create precedence for the sentence that follows, one idea organically following another until the journey of words, paragraphs, pages, concludes somewhere far from where one started to write. That is, writers, write things that make sense in some respect, as in you understand clearly the thing being described, or that you understand it more abstractly and realize that the writer is undertaking a task that tries to deal with several things--philosophical notions, contradictory arguments, overlapping historical data --and bringing a coherent framework to understand complex matters, or at least come away with a sense of what the writer is getting at.
Even Dylan's wildest lyrics, from Desolation Row to his more recent brilliance noteworthy Rough and Rowdy Ways: surreal or nonsequitur as the stanzas may be, the line limits and the need t rhyme imposed restrictions on Dylan's musings. Hey needed to wrap up his investigations into his more obscure imaginings. He gave you something to talk about. Tarantula was written on the road, in hotel rooms, on tour, rattled off in high doses of speed, and maybe other drugs too inane to bother talking about, and it indeed reads like it, snub-nosed Burroughs, Kerouac without the jivey swing. Some parts make you laugh, some good lines abound. Still, it suffers in that readers wanted their hero, the poet of their generation, to write a genuinely good of poetry or some such thing, with true believers tying themselves in self-revealing knots to defend the book that is interesting as an artifact to the historical fact of Dylan's fame and influence and not much else.
There is a part I like, effective as poetry, a bit of self-awareness that shows that Dylan realizes that his persona is false, a conspiracy between himself and the major media, and that he might have to account for the construction somewhere in the future of the whole matter.