Classical music, fortunately or not, unfolds in time. It's not like a picture you can stare at for 10 seconds or 10 hours. You need the minimum amount of education and training, and society needs to find a way to study music - not only the performances, but how to compose, how to understand why Mozart was great at what he did.
Bad music is often the result of an attempt by the untrained, something that takes for granted that you're very highly trained.
The only work that can be compared to Chopin's Etudes, innovatively, where every note is essential and one becomes completely exposed, is the Brahms-Paganini variations. These are etudes - not as interesting musically as, say, the Brahms-Handel - but they are incredible.
Bad music is the attempt to imitate something that has very strong rules and grammar.
Some pianists seem to really remember the keys and not so much the notes they play. They want to learn until it's a physical habit that can be replicated. For pianists, this is much more of a problem than for other instruments, like the violin, where you actually have to think of the pitch.
