Collaboration vs. Content vs. Availability
It really depends on the team and the nature of the presentation. Sometimes collaboration is a good thing as it involves the whole team and you are sure that what is most important to each person is will get it's opportunity in the spotlight.
On the other hand one may run into the too many cooks in the kitchen syndrome.
But the one big advantage of Google's solution was nowhere mentioned in the article: availability. Rather than bringing your presentation on a USB drive and wondering if the venue supports your version of PowerPoint, or the fonts you've used are installed, with Google Presentations, as long as the presentation PC has internet access, you have a workable presentation.
