I just watched the first episode of this series. I wouldn't watch another. The narration is good, giving a decent description of events. But it really could have been a radio program, because the visuals added almost nothing to the story. We saw the face of the narrator far too much, only because they had nothing else to show us, and other descriptions were illustrated by nearly irrelevant shots of modern cities--hundreds of street scenes of modern cities--landscapes, burning candles, horses' feet (for a cavalry charge, you see), with hardly three or four maps. The only serious illustration of the crusade came from a medieval illuminated manuscript, but we saw only two or three images, shown over and over again. I found myself looking around the room and at the ceiling occasionally, simply because there was nothing on the screen worth watching.

Get a decent book on the crusades if you're interested in the topic, a simple one will do, with lots of good illustrations. You will enjoy it more than this series.