Is your site being browsed?
Is your site being browsed for long periods of time, or are most of your visitors only looking at a couple of pages? For parts of your site that focus on advertising, promotion, and information content, you want your visitors to look around. If they look through lots of pages, that's a sign that they're interested in your site content. And if you are selling something, it's a sign that they are thinking about making a purchase.
Is your site efficient?
Conversely, having too many page views can also be a sign of site inefficiency. If visitors are looking for something specific (i.e. they are at the technical support section of your web site) and have to click through lots of pages to find what they are looking for, they may get annoyed, but persist because of need. You want your site to be efficient for people who are looking for specific things.
See also the Session Length Histogram.