No, my point was not half finished. Sentence structure influences how a sentence is read, so if it's poorly structured it will sound awkward. In fact, the sentence may totally lose its intended meaning. If I don't know what the sentence means, how do I follow the story? That is a mark of quality. If your story sounds odd and confuses the reader, it isn't good. The marker for good sentence structure is that it conveys its meaning as intended, in a way that sounds natural to the reader.

The definition you give for "good" there is another example of what I'm talking about. It's not incorrect, but given the context, it isn't the correct definition of the word. Cetain words have many different definitions. Word choice is also an objective quality of writing. Good as being of favourable character or tendency would be used for people, not objects. Here, a more accurate definition of good is "having the required qualities; of a high standard" for example a "good restaurant" would fit this definition. Another definition of good that works here may be "enjoyable or satisfying" like a "good movie." But here's the thing, something that confuses you isn't usually satisfying.

If I say "John was seeing things. He knew they weren't there, but he couldn't stop seeing them. He had finally gone mad." In that example, you can tell what definition of "mad" I'm using. Clearly, I mean that he's losing his mind. But what if I wrote: "