when WoW started Alliance was a faction plagued by internal political turmoil. King Wrynn was gone, SW nobles were conspiring with the Defias and Stormwind's upper echelon was infiltrated by Onyxia.
in Ironforge the high king's daughter was kidnapped by Dark Irons, the Wildhammers were not part of Ironforge Dwarves, Gnome refugees were flooding IF after they've lost their city to Troggs.
moving westward into Kalimdor Malfurion was trapped in the emerald dream, Fandral was planning to takeover Darnassus and was hinted to be responsible for keeping Malfurion in the emerald dream. Teldrassil itself was actually not blessed by the aspects which was the reason that it had a corruption inside it.
Aliance was not "purely good" in WoW. there were corrupt elements inside it and THAT made Alliance an interesting faction IMO. it wasn't a simple alliance of purely good factions, every side was struggling with something and as you progressed through the game you uncovered more hints and signs of cospiracies.
all of that is gone now, the alliance you see today is just a shallow cliche kingdom of goodness with an anime-looking badass king who had teenage-anger issues.
nothing much seems to be going on in Alliance these days and if there is, they've not developed it into something interesting. why has blizzard stopped working on plots and stories that made the faction interesting in the first place? most plots are solved and no new plot was planned to come in their place, the only interesting plot I saw from Ally side since WotLK was the Defias plot in Cataclysm and after that most vanilla quests that progressed the interesting questlines were replaced with shallow gimmicky/comical plots with almost no lore value.