The first and third presentations are potentially complicated messages that could have harbored a trove of tangents. Instead, they're clear, simple, and very engaging.
Next time you're mocking up your ads, ask yourself if they do as good a job as these presentations do at communicating. Don't confuse that with minimalism. Done correctly, long copy can be crystal clear and very engaging. But if your ad isn't as lucid and as smart as these presentations, try peeling back a few more layers.