What I just read about Claudio Arrau is completely insane. His recordings are not to be avoided, on the
contrary, they are a must have.
Claudio Array was an amazing interpret of Beethoven, but also of Schumann, Brahms, Chopin, Liszt and Debussy.
His interpretations were always very profound, especially in Beethoven. Some may prefer a more down to earth version of Beethoven's piano sonata, but it doesn't mean Arrau's one is to be avoided.
His Chopin's noctures are a reference. He has this very distinct sound of his own.
I love his Bach's partitia, his Liszt Transcendental Etudes, his Liszt piano concertos, Schumann's carnaval ...
When I listen to Claudio Arrau, I always envision something great, something majestic and mystical that you cannot quite grasp.
I read about Arrau that he was very serious about his art, and because of that he was not as popular as he deserved : for example in concerts, he didn't play encores just to please the audience.