PowerPoint is really a slide show. You build up a series of slides for presentation purposes. It is difficult to envisage using this for a family tree but not impossible.
How do you wish to view your slideshow? On a PC or laptop monitor (possibly projected) or on a TV?
What you could consider is having a website with links to text, photos, etc. Family Historian will build a website for you.
A large tree can be quite difficult to view on a single screen/slide.