I watched the first two hours of this last night and thought a major flaw was the continuous re-enactment: apart from a few linking moments where Graham Greene wandered in front of the 'set', and a few moments panning on a map, it was made up almost entirely of dramatic vignettes.
It would have been far better to chop these by about half (some of the sequences are repeated several times anyway), and to insert some good old-fashioned historical narrative to give context, to clarify the historical and geographical background, and to answer some basic questions. For example, the narrator several times refered to 'Canadians' and 'Americans', without clearly spelling out that this meant, respectively, French and British. I think this crucial fact would be unknown to many younger viewers. The same viewers also needed to know how it was that George Washington, who they would have probably have heard of as an American, was in earlier life a colonial British militia officer whose main aspiration was a commission from the Crown! Without this kind of basic background information, the attempt to create 'empathetic' history through drama falls flat.
Too much dramatic reconstruction like this ultimately backfires, because you realise that even the best-funded and most carefully researched docudrama can never equal Hollywood - and we've been spoiled by the Patriot, Last of the Mohicans, etc. It's a shame, because such care had clearly gone into the historical accuracy of the clothing, weapons and settings, but the fact was that the battle scenes did not come off well because there weren't the resources to portray them on a big enough scale, or to film them with the dramatic quality we've come to expect - there was little excitement in seeing rifles go off like popguns, even though they were being fired authentically.
Another consequence of too much dramatisation in documentaries is that the deficiencies of the acting become really glaring - unless you're able to persuade big names to take on these roles for a pittance. If Washington had been portrayed here a few times, then the actor used would have been adequate. But as it is he has a major role, appearing many times, and this really becomes a huge weakness in the series - the actor bears a passing resemblance to Washington, but is surely wrong in almost all other respects. Washington may sometimes have been pompous and priggish but he had a personality that made reluctant colonists follow him, and that didn't come across here at all. Washington came across as weedy and weak, with no charisma or natural leadership abilities at all. They needed a Liam Neeson!
Maybe next week's final two episodes will leave me feeling more positive, but I think the chance for a really great documentary may have been squandered.