Knowledge vs Presentation Skills

Well the other day I was in a presentation where I had some vendor explain the features of their product which was up for evaluation. The individual taking us through the features and technical details on the usage of the product was indeed highly knowledgeable about the product. When he started explaining the features, initially I thought it was just me who was having a tough time understanding his accent; which had a heavy MTI (Mother Tongue Influence); but after an hour of the session, I was unable to concentrate on what he was saying. As it is we were on a conference call, he was just running through the presentation without taking feedback of whether we understood the topic/feature.
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