Well, it isn't easy. Much longer then a chopin ballade. And Pagodes is especially difficult. To get the leggiero touch to those fast right hand figurations, is a pregnant dog, as they say here at pianostreet. But it's well worth the effort - it's one of Debussy's most inspired compositions. Soirèe dans Grenade is easy, technically, but to sustain the atmosphere is no small feat. Jardins sous la pluie is a fun piece and not that difficult once you've mastered the soft right hand accompaniment. So, yeah,I'd guess it'd be on the same level as a chopin ballade.
Topic: Debussy estampes