The earliest known critic of the play was diarist Samuel Pepys, who wrote in 1662: "it is a play of itself the worst that I ever heard in my life."[58] Poet John Dryden wrote 10 years later in praise of the play and its comic character Mercutio: "Shakespear show'd the best of his skill in his Mercutio, and he said himself, that he was forc'd to kill him in the third Act, to prevent being killed by him."[58] Criticism of the play in the 18th century was less sparse, but no less divided. Publisher Nicholas Rowe was the first critic to ponder the theme of the play, which he saw as the just punishment of the two feuding families. In mid-century, writer Charles Gildon and philosopher Lord Kames argued that the play was a failure in that it did not follow the classical rules of drama: the tragedy must occur because of some character flaw, not an accident of fate. Writer and critic Samuel Johnson, however, considered it one of Shakespeare's "most pleasing" plays.[59]
In the later part of the 18th and through the 19th century, criticism centred on debates over the moral message of the play. Actor and playwright David Garrick's 1748 adaptation excluded Rosaline: Romeo abandoning her for Juliet was seen as fickle and reckless. Critics such as Charles Dibdin argued that Rosaline had been purposely included in the play to show how reckless the hero was, and that this was the reason for his tragic end. Others argued that Friar Laurence might be Shakespeare's spokesman in his warnings against undue haste. With the advent of the 20th century, these moral arguments were disputed by critics such as Richard Green Moulton: he argued that accident, and not some character flaw, led to the lovers' deaths