Use of a corporate wiki: less wasted resources

I recently completed a consulting project for a multi-national firm that had serious communication issues. Everyone seemed to be pushing their own agenda and not listening to each other. A big problem this company faced was meaningless meetings in which everyone pretended to listen but nothing was actually accomplished.
Here is an example of what would actually happen:
The production department heads from the US, Spain, and China would have a meeting scheduled 3 weeks in advance. In preparation for the “big” meeting, the US production team would have many “small” meetings (meetings to prepare for meetings). During the 3-week period, different production supervisors and managers would prepare lengthy reports and PowerPoint presentations to circulate via email in advance of the small meetings. Note that these PP presentations were created in a way that defied logic. It was not unusual to see a 36-slide presentation with each slide containing 6 paragraphs of fine-print text!
Of course, no one would actually read the reports and PP presentations since there were so many and they were so UN-user-friendly, so no one would actually know what the other participants wanted to discuss at the pre-meeting. Everyone would then bring their own agendas to argue at the meeting and nothing much would be accomplished. Finally, when the “big” meeting came, it was a reenactment of the same confusion, magnified tenfold.
A collaborative wiki for each department would have gone a long way towards creating a common understanding and ensuring that less time and resources were wasted. Of course there are other simple things that professionals should know, such as how to create an effective presentation. In the absence of this, there should be a pre-determined format for all reports (ie: no longer than 2 pages, with graphs showing specific outputs, etc).
In the case of this corporate wiki, it would be very important to do a thorough analysis to determine what the needs and desired results of the wiki are in order to create it in such a way that it suits participant’s needs, thus providing incentives and motivation for incorporating it into corporate practices.