Why is cognos business intelligence platform difficult to implement and use?

The common cause is the lack of the necessary knowledge to make the
implementation of tools of this type.

As a matter of fact, implementing cognos is not that difficult. Its
definetly not a plug and play cd but all aspects of implementation are
in the documentation. General understanding of the Authentication
server and Databases is a prerequisite.

I can suggest you a website where you can get answers to your specific
problems in installations. Its www.ittoolbox.com. Apart from the
"Support Talk" provided by cognos.com, this is the only other website
I know of. If you are a customer of cognos, then you can use
www.cognos.com/support.