What is pageviews/user and how can you increase it?
The number of pageviews/user is the average number of pages each of your visitors will visit. A pageviews/user of 2 means that on average, each visitor visits two pages on your website. But this could mean as well that half of your visitors visit just one page (so you have a bounce rate of 50%), and the other half 3 pages.
There are many ways to increase this number: The classic one is to add a section named "You might also be interested in" to all of your pages, with links to other pages/products on your website. Another one could be to split your content pages into smaller pages.
What is a good number of pageviews/user?
There is no exact number for this. Usually the more you have, the better. But, for example, if you mainly have traffic from Google (SEO traffic) and visitors directly find the right information they are looking for, you will have a pageviews/user of 1, which is perfect. On the other hand, if you have an ecommerce website and want to sell products, a visitor's funnel will usually be the following:
Homepage -> Search -> Product -> Add to cart -> Sign up -> Pay -> Thank you
So you should have a number of pageviews/user of at least 7, or even more if you want to sell more products, or because people are usually looking for more than one product before choosing one.