What is ordinary or average is related to what the listener hears. I, for example, hear music on a different level than say a 5 year old. Time can also render a piece of music "ordinary". Now, Mozart is probably the most revered of all classical composer but I recall reading about the composer Prokofiev ridiculing Mozart for his narrow harmonic pallet ( i.e use/choice of chords and their progression). But that is like blaiming a great athlete from years ago for not running as fast as a modern athlete.