The Garrison as implemented in WoD destroyed every single family/social guild I had chars in. It was amazing how many guilds went from having ~50 to 60 people online during the weekends to ghost towns. It erased all of the social people in the “middle” of the player base. Leaving the hard core solo players and the raider types going forward. I call the people that left in WoD the “Missing Middle”. They were the folks getting groups together to run old instances, farm transmog, or work on achievements.
Blizzard implemented the WoD garrisons with absolutely no clue what it would do the the social connections in the player base.
I touched on this in an earlier post in a different thread.
Having said that. I use WoD to level, and I always seem to have a maxed level 3 garrison when I hit max level on a new char.