Common Reasons for Ineffective Presentations

Not engaging the audience in the beginning of the presentation
Poorly organized information (no order or logic) or lack of clear purpose
Poorly designed presentation materials (poor color contrast, background design, font size or type, etc.)
Incorrect or misleading graphs, charts and visuals
Too many bullets per slide, or too many lines for each bullet
Lack of preparation and rehearsal
Lack of confidence and enthusiasm about the topic
Inconsistent pace (too much time spent on one part and too little time left for the rest)
Lack of eye contact with the audience, poor body language and looking at or talking towards the screen
Inaudible or monotone delivery, mispronunciation of words and reading the slides verbatim
Not knowing how to use delivery technologies or not being prepared for the technology available
Poor or incorrect use of technology tools or spending too much to get the technology working
Not following time limits (too much material) and lack of consideration for other presenters
Mistakes in the content, and glaring spelling and grammatical errors in the slides
Ending the presentation abruptly, not leaving enough time for questions and answers and not handling questions and answers well