Messages delivered by presenters should be from the heart. Avoid (debates excepted) speaking on issues in which you have no belief. Avoid being a hypocritical presenter, a phyyric speaker.
When speaking, use POWERPOINT and props to support speech. Don’t read verbatim from power-points. KNOW your subject in case the power-point goes on the blink. Have a fallback position.
If an AUDIENCE MEMBER, take time to THANK presenters if you genuinely believe them to have delivered a quality message. Presenters value appreciation and with that constructive, skill honing advice.