Isaac Bashevis Singer reportedly related that there are [at least] three characteristics that a work of fiction must possess [to be well-written]:
1. It must have a precise and suspenseful plot
2. The author must feel a passionate urge to write it
3. He must have the conviction, or at least the illusion, that he is the only one who can handle this particular theme
We would add, that of the three, number 2 is the most important - especially as it relates to actually getting the writing done, because, like we've mentioned a number of times, it will be very difficult for a writer to write for hours without the energy from a topic of passion.