Most presenters talk too much. They present too much information of little interest and save their important points for the end of their presentation. You can tell this is happening if the audience is relatively tuned out during the presentation but perks up toward the end. Some audiences never perk up. They just look relieved when it’s over.
Most presenters don’t know how to create a powerful set of Key Messages that land with impact and move their audience. They just throw out excessive details and hope some of them will matter.