As programs go, PowerPoint is not terribly difficult to learn. New slide. Insert text. Save. Go. It is routinely used with students as young as the elementary grades and, in some cases, is the hallmark of technology implementation in the school.
When teaching PowerPoint to students, it’s not the program itself that is difficult to communicate, rather it’s the important idea that PowerPoint (as with its non-Microsoft cousins, Apple’s Keynote and OpenOffice’s Impress) is a single tool with the purpose of supporting the communication - presentation - of an idea. The PowerPoint slide deck is not intended to replace the presenter, nor to display every single word the presenter will say. The slides should do no harm - that is, the content of the slides should not take away from the presentation with distracting graphic, backgrounds, sound effects or transitions. Not to say these are all bad additions, but that they must be selected carefully with the audience and the message in mind.
The ability to deliver an effective oral presentation is a part of our state standards. Where an expectation to include presentation support tools exists, oral presentation skills instruction needs to include good use of presentation tools as a part of teaching the topic.
I want to point you toward two recent articles on the topic of slide design. Take a look at these ideas and think about how they can help polish your own presentation skills.
Garr Reynolds at PresentationZen
: PowerPoint tips that Are clear and to the point 
Stephen M. Kosslyn at Oxford University Press blog: PowerPoint for Martians?