Which is why you shouldn't leave. Chances are its gonna get rated back up. Also, the author that you're probably talking about still has every chapter green. And it shouldn't matter what other people think.
Author's response
Oh no I'm not leaving, It's just this is kind of getting on my nerves and it's unfair on people who have really good stories, yeah their chapters are all green but the overall story is rated as trainwreck which just sucks for them. It shouldn't matter what people think but inevitably it does, especially when you believed in that story and put a lot of effort into it.