Of course PS/SSM aren't going to release a documentary that portrays them in a negative light but I agree that it didn't seem particularly PR friendly. Schreier has, quite rightly, been very strongly pushing the idea of unionisation and talking about the "unsustainable" industry for a while now though and it may colour his opinion. He probably just wanted a bigger focus on the crunch and pressures involved but I don't feel like it glossed over the sacrifices made either. Just like people who wanted more focus on the actual development of certain parts of the game there is only so much time for each aspect in a 2 hour doc.
I mean, it was pretty obvious to me that they had an enormous pressure to succeed due to the failure of the cancelled game and the investment on a new facility. It was probably an "all or nothing" situation.