I love Liszt's Transcendental Etudes, the Concert Etudes, the Annees de Pelerinage, Mephisto Waltz and the Sonata in particular. He composed mostly for piano, but in large works for piano and orchestra or just orchestra, he was definitely not a great orchestrator, unlike Brahms, Mendelssohn or Schumann who could write very fine orchestrations. If you look at the piano works, one thing that most people agree on is that the quality is not consistent. Some pieces are works of pure genius. For example, his Les jeux d'eau a la Villa D'Este is a landmark of the literature presaging the advent of Impressionism and Ravel's later Jeux d'Eau. But some of Liszt's piano output is of inferior quality. Another group, the late works, are experimental and are considered quite interesting from a historical perspective, and are in their own class. Liszt was once asked how history would judge his music. His reply was that he would be most remembered for his treatment of harmony, which is, in fact, a hallmark of innovation in his music, making it what it is. So he was probably correct in that self-assessment. By the end of his life, Liszt had made important contributions as a pianist, composer, transcriber, pedagogue and conductor/champion of Wagner's music. I believe he maintains a prominent place among composers, but is probably not one of the greatest. Just my opinion.