Chris Petrilli calls BS on the need for a "powerful" presentation application:
Here’s the thing. PowerPoint sucks. It sucks on a nearly epic scale. The best thing about the first version of Keynote was that it didn’t have 75% of PowerPoint’s functionality. That was a good thing . Most things in PowerPoint are useless at best, and a brain-melting disaster of bullet-point hell. I don’t want lots of clip-art, animations, or dancing paper clips. I don’t want sparkly text.
Recently, I've gone away from using presentations completely - I just give a talk. That way, the audience is actually listening to what I say, rather than reading the slides.