Haha, yeah well I have had many, many instances like that in museums myself. But the point I was getting at is that creativity and craftsmanship are not mutually exclusive from one another and we shouldnt assume that because something is made for sheer aesthetic reasons, it lacks craftsmanship. (the painting may be ugly, but is it a well crafted painting).
As for whether a particular work of art pleases our aesthetic or not, that truly is an individual thing, it all comes down to what we are sensitive too.
But without craftsmanship, an artist cannot truly realize his vision to begin with. I have wanted to scream many times when I see something in an art gallery at a distance that looks intriguing, only to realize upon closer inspection how poorly it was constructed and how little the artist truly understood about the materials he was working with. So let us not confuse bad art or poorly crafted art for all art.
CB