Power Point is ubiquitous because it offers improved communications. Just because some journalist isn't old enough to remember slides and overhead projectors doesn't mean such things didn't exist. If there's a shortcoming with Power Point it's that it is based on the idea of printing everything out rather than dynamic interaction. It's an old paradigm, but it's hard to beat something modelled on the physical world.
Data representation should properly be at least two variables plotted against one another, neither of which is time.