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Dr Tyson is very good at popularizing science, the scientific method and the vast field of astrophysics...we need more folks like him. He is a great speaker, albeit a bit overly dramatic in these lectures, speaking clearly and enthusiastically about a subject that he clearly knows and loves.
In the video-downloaded version I watched (twice, actually) I was under-impressed with the level of instruction (middle school, home schooling level, especially if supplemented with better graphics), perhaps because it's a little old...the course notes were published in 2003, and no reference is older than 2002. Quite a bit of progress has been made in the field of astrophysics since then (and was this series released in 2008?).
I can't really recommend this series to the older, more experienced student/person...maybe the updated (2012) Tyson lectures in 'The Inexplicable Universe: Unsolved Mysteries ' is a better choice...when it's on sale and you have a super coupon.