What is the ruling on one who believes that dhikr and the Qur'an alone are better than prayer? And is he considered astray and dissolute, or in violation of the consensus of Muslims? And what is the judgment upon him?

This statement is incorrect and contrary to the texts and scholarly consensus, for prayer is superior to mere remembrance (dhikr) by text and consensus. If the one who made the statement persists in their view after being advised and clarified, then they are mistaken and should not be followed.