Making engaging turret sections in Dark Ages
This is just my opinion; feel free to disagree. When it comes to the turret sections (yes, I know there are very few) believe TDA could have taken a cue from other games. I guess they knew how boring they were, that's why they limited them to but a few encounters. But they didn't have to be.
Here's the easy solution. The turret CAN be detached. However, if detached, you have limited ammo. That way, you decide: unlimited ammo but fixed position, or freedom of movement but limited ammo and no shield (perhaps the turret itself could absorb some of the damage).
And by having more turrets scattered throughout the game, they could have worked as a temporary power-up. Get in the turret, take it off, and lay waste to the demons.