It is NOT a reading of a paper. Speaker is clearly comfortable in front of the group and can be heard by all. Level of presentation is generally appropriate. Pacing is sometimes too fast or slow. Aspects of presentation are too elementary or too sophisticated for audience.
Presenter seems uncomfortable and can be heard only if listener is very attentive.
Much of the information is read. Presentation consistently is too elementary or too sophisticated for the audience. Information is read to audience. Presenter is obviously anxious and cannot be heard. They are prepared in a professional manner.