Man is created in the image of God. His greatness is derived from the image of God within him.
The image of God is marred by sin. Sin may seem exciting in the moment, but it deadens man making him worse for the sin.
When a man accepts Jesus and begins to be transformed by sanctification through the work of the Holy Spirit he becomes who he was always meant to be. When we follow God in faith our lives are enriched.
The law of God seems dull and a dreary business to sinful man. The law of course is meant to protect human happiness not hinder it.
God has our best interest in mind. This is evidenced in that God sent his only begotten son into the world to save man.
God's love for man is so great that he loved us while we were his enemies. God is on our side. It is our sin nature which tries to convince us that God does not have our interests in mind.
Of course the interest of man is faith in God. Man can only find true joy when he finds the joy in God.
The call of the bible to worship God may seem dull to sinful man. But it is man's true calling and man will only truly be happy when he finds the joy of his calling.