What makes a good piece of writing?

Words that flow into each other, as natural and effortless as splashing waves foaming into sentences?

When the words fall into place like a jigsaw puzzle that tells the whole story in a single effortless glance?

The content/thought need not always be original. The way it is expressed should be an insight into a refreshing point of view.

There is great pleasure derived from finding that perfect but elusive word that describes a given experience, thought.