Professor Holmes is an engaging presenter who at times seems to actively participate in the stories he's telling (he dons a suit of armor at one point similar to what the French were using at Agincourt) and really makes the history come to life by actually "taking you there" to look at the terrain and enables one to better perceive the scope of the battle in question.
I also appreciate his presentation of events for being brief and to the point with little dallying and few attempts at social commentary; preferring to let the events and actors speak for themselves. The viewer is thus asked to draw some conclusions of their own. All in all, Professor Holmes is scholarly but never dull; like visiting a battlefield with your favorite history professor from college.