It is well known that Thomas Kyd's The Spanish Tragedy established the genre of revenge tragedy in Elizabethan drama. The play contains many elements such as the appearance of a ghost, a play within the play and madness that were frequently used in subsequent revenge tragedies.
Hamlet undoubtedly has the outer structure of a revenge tragedy but its extreme popularity makes me wonder whether it has certain features that are unusual in a conventional revenge tragedy? Is Hamlet's tendency to procastinate one of them? Are there any others?