If a highway billboard always has the same advertisement plastered across it, it's not long before you blow past it without noticing the message. The same goes for your website. If your site's content isn't being managed efficiently and updated regularly, you run the risk of being mistaken for a static site. Each organization has its own particular needs and processes for accomplishing them. Perhaps a small team has responsibility for your site's content.
Content management is a rapidly increasing and diversifying area.
Take a long hard look at your needs, your operations, and processes to determine what kind of system suits you best. The content management niche of the market is growing increasingly crowded, so seek out the voice of experience. Talk to vendors, and ask questions that go beyond the FAQs listed on their websites and in their promotional materials. With content management systems, as with anything else, it's obvious that one size does not fit all. Make the investment to ensure you're using an appropriate system.