Coursera tends to be less consistent, but I've had some really good classes...and one so bad that I was 'that guy' who stated everything they thought was wrong with the class.
Anyway, the big difference I see is that MIT OCW films instructors in their natural habitat and all the Coursera videos are shot up close and personal and this makes some professors unusually self conscious. Others are willing to not worry about production values and let their warts and quirks come across - they will be informative but not particularly entertaining...e.g. Ullman or Sedgewick both of whose courses are really good if a student is interested in the topic.
Anyway, the big difference I see is that MIT OCW films instructors in their natural habitat and all the Coursera videos are shot up close and personal and this makes some professors unusually self conscious. Others are willing to not worry about production values and let their warts and quirks come across - they will be informative but not particularly entertaining...e.g. Ullman or Sedgewick both of whose courses are really good if a student is interested in the topic.