'Dickens In Camp' is considered Bret Harte's masterpiece of verse due to its sincere and deeply emotional content, and its exceptional poetic expression. Bret Harte was known for his ability to create stories that captured the hearts of readers, and his work is said to have a lasting impact on the public. He is often compared to the great British writer, Charles Dickens, who was also known for his ability to evoke strong emotions in his readers.