where is the line drawn?

In response to Skyla's question.In your opinion, where is the line drawn between something that can be considered a work of art and something that doesn't quite meet the standards?

I think that it is very hard to distinguish a line between good art and art that doesn't quite meet standards.In my opinion, the line is drawn when a piece of work shows no effort. As i have said before, I prefer works that take time to complete. When it comes down to it, I would call Michelangelo's works art over many other pieces I have come into contact with. I think it is far easier to create a definition based on exclusion, as compared to inclusion though. For me at least, it is easier to see something and say no, that's not art, instead of looking at art that has been created and trying to decide whether time has been put in or not. although, I guess it could go both ways. sometimes it is very hard to decide whether art is art or not.
question: Are there many cases where someone spends a ton of time on a piece and it turns out awful looking?