Who has the power, the point?
While Powerpoint is a fantastic presentation tool, it is hardly truly interactive. Using it as an easy option avoiding personal limitions of presentation is usually very transparent to the observer. What Powerpoint does not do is allow you, the instructor, to illicit, spontaneously the knowledge of the student and then ad hoc take them at their pace to where they should be. As an instructor/teacher that is what you must be able to do! That is interact with your student and not simply lecture them until they fall asleep.
Now, an interactive white board such as used in primary schools these days could be a winner.