This is a profoundly naturalistic novel, fixed on the dark side of the human species, his vices like jealousy, avarice and greed. `(Alcohol) roused the man, or rather the brute in the man, and now not only roused it, but goaded it to evil.'
Its philosophy is determinism: people follow their desires `blindly, recklessly, furious and raging at every obstacle' in `the changeless order of things'.
This determinism of no escape is perfectly illustrated in the last image: `As McTeague rose to his feet, he felt a pull at his right wrist. Looking down, he saw that Marcus in that last struggle had found the strength to handcuff their wrists together.'
The picture is sometimes overdone, a caricature: `The hideous yelling of a hurt beast, the squealing of a wounded elephant.'
And ultimately, the novel is less impressive than `The Pit' or `The Octopus', because it lacks a framework. People are acting as in a void. The novel is a pure illustration of characters. There is no social conditioning; e.g., the fact that a new legislation is introduced to regulate the profession of dentist is mainly used as a vengeance, out of jealousy.
But, all in all, it is (still) a courageous book and a very worth-while read.