What makes a good peice of art?

Does a good design just have to be aesthetically pleasing? or is there more to it than that? And who is the one that decides whether something looks good or not.. isn't it meant to be in the eye of the beholder after all. I know many superficial artist that are making loads of money because there art is considered good by the majority of people and show cases a lot of talent but that doesn't really mean that it is a good piece of art.. what about the rest of the people who disagree with the majority of people.. yes this maybe a little confusing but to me aesthetic appearance in art is only half of the story as it is the meaning that is being conveyed that is really most important. I guess though that is the same if something means a lot to the artist and it does not mean much to the rest of the world then that meaning behind the art artist will never be considered any good even though it may convey a deep emotion of the artist. Times change and opinions change what is good a couple years ago may go out of fashion for the majority of people later on. So I dont think you can scale how good a piece of art or design is on what people think of it.