I would not rank Debussey as one of the great composers. He definitely wrote some nice stuff but cannot compare with the truly great: Bach, Mozart, Handel, Beethoven, Haydn etc.
Claire de Lune is a little gem. La Mer is good and his piano music has lots of good stuff in it. But, with the exception of Daphnis and Chloe, his major works are not played that often and I would venture to say that even lovers of classical music have never heard a lot of his bigger pieces.
I adore Debussy, even if I don’t program or perform him often.
Except for “Suite Bergamasque” which gets put on at least one recital program every year. This suite for solo piano includes the iconic “Claire de Lune.
He wrote so fluidly for the piano and was a master orchestrator he only wrote one work for both together, and its not a traditional concerto, but rather a Fantasie for Piano and Orchestra. I played that last in 2004. Its terrific.