Heres the thing...
Between the WC RTS games and WOW until LK, Blizzard did a great job in getting people to invest in the various factions. To make them care what happens. To make them want to see what happens next. Granted, people didn't have much faction pride in the Alliance, but hey still cared.
Sure...they are pixels in a game - but they are OUR pixels in OUR game.
Since LK? Blizzard done a great job in destroying that sense, for the Alliance at least. And Alliance faction pride was never that high to begin with. Alliance players play the game...and they see loss after loss. They get to see important quests and stories from Vanilla either removed or retconned for no good reason. Yes - the Alliance were denied even their vanilla victories - and what sort of message does that send to Alliance players? That giving the Horde a generic Hunter trainer is more important than giving them a sense of faction pride. They see their faction being depicted as idiots. As soft touches. They get to see losses not through clever tactics on the Hordes part, but through the use of stupid, idiotic Deus Ex Machinas. They get to see their faction treated not as a serious player, but as a joke. They get to see the Alliance snatch defeat from the jaws of victory time after time after time.
And then they see what the Horde got. Not only the victories, but the sense of pride. The sense of polish in the quests and stories. There were no cheesy CSI rip offs for the Horde. There were no sudden unexplained reversals that resulted in idiotic defeats. They got to win, they got to do it in style, they got a high polished and developed storyline, interaction with their faction leaders and they got to stick two fingers up to the Alliance whilst doing so.
Alliance players get told - Sorry, we ran out of time so we couldn't give you the experience we wanted you to have. Here, have a cookie.
So, yes...there is a bit of jealousy there. But that's also because players cared about their faction. And noone likes to see their faction getting the short end of the stick. Especially in game where BOTH sides are expected to get equal development and attention.
Yes - we all know about Vanilla. Big secret? That doesn't change a thing. Blizzard messed up with cataclysm, it messed up big style, it alienated a lot of Alliance players and its refusal or inability to correct that has brought us to the current situation. The Horde problems with Vanilla were as nothing compared with what the Alliance are going through now.
The Alliance reaction is understandable. They get involvement but no progression, no development, no story of their own. They get a substandard poorly developed set of quests. Blizzard so ignored the Alliance story because "they don't need one" that they end up sabotaging their own questlines. They simply ended up reinforcing the notion that the Alliance aren't worth Blizzards time or effort.
EJL