I don't claim to be an expert in art; I can only give you my subjective impression about those paintings/etc.
Unlike science, it's true that art does admit subjective opinion. You can like a work of art not considered valuable and not like someting treasured as excellent.
BUT this subjectivism only goes so far.
Any given work of art has an intrinsic objective value that doesn't change depending on whether you like it or not.
Star trek V is, objectively, NOT a good movie, JarodRussel.