Did you start WoD after patch 6.2 or something?
At the point the player base disappeared, there was no flying nor was there ever going to be any flying. The developers kept stringing along players with the promise of "flight will get added later" until that infamous Memorial Day weekend Polygon interview when Ion offhandedly mentions they decided the game didn't need flying. They had already lost a third of the player base by that point and the mass subscription cancellations after that interview is what forced them into putting Pathfinder together so players would get flight.
The storyline for Horde was fine. I actually enjoyed it more during beta testing than I enjoyed the Alliance story but then I mained Alliance so playing through Horde was a change of pace.
The other killer was the lack of anything for players to do at end game other than raid or sit AFK in their Garrison. Would you have stuck it out in the Garrison if the mission table rewards had remained the same as they were at WoD launch (or wait - you may not have been there at launch)? Players were angry that those tables lacked any interesting rewards. It wasn't until they beefed up and expanded the treasure missions in 6.1 that players started getting obsessed with their Garrisons, with those gold mines ripping apart the player economy.
Like Padudu, a bit confused that you're bringing Civ into this. It's got nothing in common with Island Sanctuary.
