So I saw the movie at the gala premiere last night - MGen Milner, LGen (Ret'd) Leslie and LGen (Ret'd) Dallaire were also in attendance, as were a few officers in Mess Kit (and one Cpl in DEU).
To cut to the chase, it isn't Passchendaele. There is a very small relationship shown, but it didn't distract from the movie in general. Obviously folks in the CAF will pick apart technical details but aside from Paul Gross's beard, it seemed like they at least tried to keep it somewhat accurate - they used quite a bit of footage from KAF and Kandahar province shot in 2010-2011 and it showed.
In short - if I wasn't in the military and saw Hyena Road, I would come out of it with a greater respect of the situations that happened over there. But I am, and that beard really bothered me. >