It had some promise at the beginning but as the book wore on, it became more and more of a slog to read. As many other reviewers have pointed out, the racism was revolting. Even if you took that away, however, the narrative was so uneven, poorly-paced, unrealistic, and filled with unnecessary minutiae about ships that I gave up when they were rescued by the ship from Liverpool.
That Pym survived as long as he did - twice - without food and water was too much to believe, especially the second time when he hadn't even recovered from the first time. And the dog! His beloved Tiger who he didn't mention at all until the dog showed up unexpectedly, and then whose death didn't even merit being noticed, let alone mourned.
I skimmed most of the part where they were shipwrecked, because it was so mind-numbingly dull and and so ridiculously implausible that they survived, but the thing that made me throw in the towel was that, when they were rescued, Pym immediately started judging their rescue ship as being unsuitable. This guy is the king of choosy beggars. That was enough for me - I was reading this while ill and desperately bored, but staring at the walls was a more entertaining option than this dreck.