Did Richard Wagner not succeed in creating great operas?

Richard Wagner is renowned for his contributions to the world of opera. His groundbreaking works, such as "The Ring of the Nibelung" tetralogy, "Tristan und Isolde," and "Parsifal," are considered masterpieces of the operatic genre and continue to be performed around the world to great acclaim. Not only was he a composer, but also an innovative conductor and visionary stage director, forever shaping the aesthetics of opera.