My father was an artist, with whom I had many interesting discussion about art. His very firmly held view was that what constitues a good painting in and of itself has very little, if anything at all, to do with such things as subject matter, degree of realism or amount of detail.
All these are of course matters that are likely to evoke reaction and emotion, and as such he found them worthy of consideration and opinion, but they were still to him very much secondary issues. What really mattered for him was how well form and colour worked within the confines of the (essentially two-dimensional) surface as delimited by a paintings outer edges.
For my part, I clearly did not inherit his capacity for reading form, and so I have never been able to really see what he obviously saw; one (and possibly two) of my brothers did, and from many years of discussions with my father and brothers, I have come to the conclusion that their's was and is a minority view for the simple reason that such levels of sensitivity to form is a relatively rare commodity.
Of course, none of the above has ever stopped me from enjoying the art I happen to like in my way: if I like something, that is enough for me, and I have never felt any particular need to have my personal judgements of taste justified by anybody else, nor do I really care to sit in judgment on other people's tastes or preference — as the old maxim goes, de gustibus non est dispuntandum …
/Mattias