I found PowerPoint a helpful tool for showing my students how to organize information and to identify relationships between pieces of data.
My school district taught all students how to create their own PowerPoint presentations during the elementary years, and the possibilities of that technology were revisited and expanded throughout succeeding years. Students can make very superficial presentations that are nothing more than regurgitation of information they have found and will promptly forget. I have also had students who spent a lot of time and effort and thought assembling presentations that combined effects and information and higher-level organizational skills and thoughts to produce superior representations of high quality learning.
As with most tools, it's all in when, how, and why it's used.