I hope the bastion system is good. As a DM, and as a player, having campaign immersion options like this that work right of the box is a huge boon.
The "video game" criticism is bizarre to me, since the rest of the game - adventures leveling up, adding equipment numbers, activating abilities, killing things - is a vastly more common video game paradigm than stronghold management. It's adding a niche video game genre on top of a base system that's already a super popular and overly saturated video game genre.
The thing that I really want out of a DMG, and I'm sure I won't get, is a huge section on traps, hazards, and the mechanical knobs to tweak them quickly and easily. I'd like a resource that allows me to slap an exploration challenge together as easily as you can pick monsters out of the MM and just have a fight.