Great for viewing, but impractical for editing
Unlike any other iPad app, PowerPoint will faithfully reproduce all .ppt and .pptx files I have tried. However, other than minor text changes, it is so underwhelming for editing to be unusable. There is inking and lasso select, which are nice, but lasso select will not include shapes in its selection, only inked objects. This makes it unusable for diagrams with more than about 6 shapes.
Paodequai about
Microsoft PowerPoint