Your HubPages score is a reflection of the quality of content that you put out there. In essence, the quality guidelines that HubPages follows, falls primarily inline with Google's guidelines. If the quality is high, you'll rank higher.
Over the years, Google has been razing the Web and eradicating it of poorly-written content that adds no value. We've seen this with the algorithm adjustments such as Google Panda, Penguin, and Exact-Match Domains. Link farms, content farms, and other poor-quality content sites lost heavily during this period.
If you want to get a high HubPages score, here is what you have to do:
#1 - Write a Keyword-Centric Hub: No one wants to read a Hub (or any article anywhere on the Web for that matter) that veers off topic and goes on tangents. Stay the course and focus your content on a specific question, topic, or keyword.
#2 - Write Lengthy Content - Your Hub should be at least 1000 words in length, while also staying on topic. If you just try to fill in words here, then your score will naturally decrease.
#3 - Well-Written Content - The Hub must be well-written. It must provide an exceedingly-high amount of value. Don't just throw the Hub together. Ensure that it's well-researched and that you know what you're talking about.
#4 - Ensure that it's Error-Free - You absolutely must not have spelling or grammar errors in your Hub. If you don't care about the overall appearance of the Hub, then you won't rank high. Check it three or four times if you have to, until there are no errors left.
# 5 - Sectioned Content - Google and HubPages want content that's easy to read. You must section your content so that it's easy to read and understand. Use keyword-rich heading tags to ensure that people know what to expect in any given section.
#6 - High-Quality Images - You can't just throw any image up there. Both Google and HubPages expect high-quality images. Don't find blurry images or images that aren't on topic. Find the right image and ensure that you have the right to use it.
#7 - Share your Content - A very big part of the equation is the number of inbound links to your content. Share the content on other High PageRank sites such as Google Plus, Facebook, and Twitter.
#8 - Few Outbound Links - Don't clutter your content with tons of outbound links. Have 3 or less links in your content, and ensure that they're relevant links. Having only one link would be the ideal situation.
Hopefully this helps some of you out...