The requirements that you gather from user perspective is very important. So is interpreting right. You have to check the following regarding the requirements of data and information.
1. What data is required?
2. How regularly the content is updated and how viewers are accessing the content as they get updated?
3. What kind of interface suits the content authors?
4. How to go about archiving or categorizing old content to make it available for access on request?
5. What kind of administrative interface will suit the need?
These are the main functional aspects that can give a good insight of requirements. Comparing the answers of these questions to the features available from the content management system can give you the right answers of whether it is suitable or not for your need.