This is an interesting question you pose. It depends what you mean by the word 'good' writer. Is a good writer someone who writes concise, technically brilliant English, someone who writes attractive, informal English or is it someone who gets everything out in a readable heap?
Is a good writer for HubPages someone who just attracts the most readers/traffic because they know SEO, regardless of their style?
I'm only a beginner on HubPages but I've seen enough already to know that there are technically excellent writers on this site and some who obviously haven't yet reached what I consider to be an adequate level. It shocks me to see repeated mistakes, both in grammar and syntax, in some hubs. But ongoing work by HubPages and hubbers seeks to gradually reduce these low quality articles, which is all for the good of the site as a whole.
There are some issues around that need clarification. Originality is one. Spinning is another. Hubs that are way too personal is third.
When I see unoriginal writing higher ranked than original work I get frustrated. I know this is only because of backlinks and such, and the way the search engines go about their business rewarding links rather than original writing. But that's the nature of the beast at present.
In my eyes, content is not king - SEO and links are sharing the crown!
The quest for all writers is to strike the balance. Keep faith with your original style, learn SEO, link and promote as much as you can, never knowingly spam, and find your niche.
Much appreciate your question.