Ranked from best to worst, in my opinion.

Rating:

10/10 - Complete masterpiece, personal favorite. Not flawless but as close to perfection as possible.

9/10 - Masterpiece. Slight flaws here and there, but a fantastic novel.

8/10 - Very good. Not quite a masterpiece, but close.

7/10 - Good. Has flaws but they don't drag the novel down too much.

6/10 - Decent. Somewhat significant issues or poor writing but still overall not bad.

5/10 - Average. Satisfactory story but likely not particularly innovative, pretty generic, and has plenty of problems.

4/10 - Somewhat bad. Slightly poor story, large flaws and low innovation. Still readable.

3/10 - Bad. The story is bad, or the characters are bad, it is very generic, or there are very big issues. Or all four.

2/10 - Terrible. Almost unreadable, the story is completely riddled with issues and is deeply frustrating.

1/10 - Unreadable. 

X - Unfinished, will probably never finish. The novel is probably too boring or has fallen off to an extreme degree, to the point where I can't even bring myself to finish it. Some of these novels might pick up later and become really good, but currently, they're terrible.