Sorry, I voted "no it just isn't that great".
Earlier this year I played his Cello Sonata Op.18. What a lot of work for very little musical reward; after Ruby states his themes, he just juggles them aimlessly and fills in the void with great expaneses of busy but very difficult
passagework. The first and last movements had some interesting and charming moments but that middle movement was just dreadful; what a sacharine syrupy victorian gob o' goo. I ended up treating the piece as an etude, and it did help me regain a great deal of facility after some rough times.
Since this was a joint recital of Russian music, I read through and listened to a great deal of his solo piano music, but it all came up wanting; I almost programmed #22 from "Kameniy-ostrov" but instead opted for Medtner, Scriabin and Rachmaninov for my solo selections. Their music is vastly superior to Rubinstein's; as President Carter wrote, "Why Not the Best?"
If I want to hear Rubinstein, I'll listen to Josef Hoffman's live recording of the d minor Concerto. It is an astonishing performance.
Gee I just read this and it's awfully negative, but it's my well considered opinion.
Perhaps I'll post some of the Rubinstein Sonata...