Isaiah was the greatest of the prophets and a superb master of language. If you enjoy beautiful, rolling cadences and marvelous literary passages, you will enjoy this book for that reason alone.
Isaiah is the fullest revelation of Christ in the Old Testament -- so much so, that it is often called "the gospel according to Isaiah." To acquaint yourself with these magnificent, prophetic passages looking forward to Christ is to experience much of the richness and depth of Scripture.
Also, the prophetic nature of the book of Isaiah is one of the great proofs that the Bible is the word of God, for Isaiah lived some 724 years before Christ. The many passages looking forward to the Messiah point so clearly to Christ and are fulfilled in him, and thereby constitute an unanswerable argument for the divine inspiration of the book.
