Couldn't we just weakon garrisons? I mean sure, garrisons have a cool factor and making them weaker than green cover will probably lead to people avoiding them, but I never understood why garrisons are so much stronger than green cover.
They are already (very slightly) weaker than green cover in terms of rec. accuracy or damage reduction, can't remember which.
What I would love to see is a slight nerf of garrisons so they end up between heavy and light cover in terms of received accuracy/damage (still closer to green, though). That way, the number of windows and therefore the direction of attack would matter more. Garrisons would still provide unique benefits and disadvantages compared to green cover:
+ no negation at close range;
+ 360 degree protection;
+ entities teleporting between windows to immediately (re)target enemies;
- limited number of windows;
- instawipe potential from flames/collapse;
- lower damage/rec. accuracy.
It would really open up infantry combat on some maps and make the braindead rush to the house less... braindead. The main issue is that it doesn't really make sense for a stone house to provide less protection than a short wall, but oh well.