Poetry exposes and satirizes the money worship of the British nobility and bourgeoisie. The British ruling class boasted about "freedom" and "rights", but when Don Juan first came to London, he was attacked by robbers. The poem denounces Sir Casterly, a British aristocrat, as a "villain" and a "slave maker", and condemns Wellington, who was praised by the ruling class at that time, as a "first-class executioner". British upper class is gorgeous in appearance, but extremely decadent and ugly in heart.

Don Juan is Byron's most important group of poems, which is half-poetic, half-narrative, half-argumentative, realistic in content, strange and relaxed in brushwork. After the first and second chapters were published anonymously, they immediately caused great repercussions. British newspapers defending bourgeois decency rose up and attacked it, accusing it of attacking religion and morality, which was "a mockery of decency, good feelings and the code of conduct necessary for maintaining society" and "disgusting to every normal mind", and so on.

But it is also highly respected. Writer Walter Scott said that Don Juan was "as comprehensive as Shakespeare, he covered every topic of life, plucked every string on the sacred piano and played the smallest, strongest and most shocking tune." Goethe, a poet, said, "Don Juan is a work of complete genius-cynical to the point of almost desperate vitriol, gentle to delicate and touching feelings ...". After the sixteenth chapter of Don Juan was written, Byron was ready to devote himself to the national liberation movement in Greece.