But is it good?
I absolutely loved the first series, I thought it was really cleverly written and all tied together really well. However, when I came to watch the 2nd and 3rd series I was really very disappointed. A lot of the same material came up over and over again and by the beginning of the third series, the rubbish graphics and weird predictions he makes seem only to have comical value. Also, even though it is very informative, I found that I didn't really learn all that much (from series 2 and 3). It basically had significant events in history and then tenuously linked them together with the same (incredibly repetitive) formula that was really confusing at times. Re-connections was good, but I think he should have either changed the format or simply stopped after the first series.
If you like this, check out "The Ascent of Man" by J. Bronowski and "Civilisation" by Kenneth Clark.