This is a quote from the official forums on a thread called, "Ghostcrawler on Draenei". It sums up my feelings on their neglect quite nicely:
"01/29/2013 08:51 AM
This has become something of a self-fulfilling prophecy. "We don't do anything with them because they don't fit, and they don't fit because we haven't done anything with them."
The draenei don't fit any worse in the current (WoW-era) state of Warcraft lore than anything else, but Metzen let the jokes about "lolore retcons lol" and "lololol spacegoats lol" get to him, went off to cry in a corner, and hasn't had the stone to touch the draenei since, even though they're really the one race in the lineup that isn't a takeoff of a standard-issue fantasy race. There have been plenty of ways to integrate the draenei into the greater Alliance and the greater storyline, Blizzard's just always been too lazy or too timid or too busy to use them.
-Nobundo was the first draenei to speak with the elements, and brought the concept of shamanism to the draenei who embraced it wholesale. He's a visionary, one of the major heroes of his race. Where is he in Cataclysm, the big shaman expansion? He doesn't get so much as a single line of dialogue, because Cataclysm was The Thrall Show.
-What about Vindicator Maraad? He's supposedly Garona's uncle by blood and a powerful vindicator, but he's never done a bloody thing in-game, just stands on the Skyshredder's deck in Icecrown as a piece of scenery.
-Draenei have long known the power of the arcane, their mages powerful and more, some of them boasting over twenty millennia of experience. Why don't we see a couple of them in Dalaran, sharing their knowledge? The Kirin Tor would lap that !@#$ up.
-Draenei count amongst their number their own paladin order, light-bringers who serve to protect their race and smash the unholy forces that oppose them. Why couldn't we see them bringing their own strength and experience to bear against the Scourge in Wrath? Blizzard gives us one half-assed explanation about some guy (who later turns out to be a Scourge agent) trying to stonewall them, then forgets about it entirely.
-What about Forest Song in Ashenvale? Why not use it as a jumping-off point in Cataclysm to show some bitter draenei taking the chance to take it to the orcs in revenge? Instead Blizzard spends their time turning Zoram'gar into a fortress and putting a mouthy fire elemental in the middle of the zone.
I'm just throwing this stuff out here, seriously.
-How about in Swamp of Sorrows a group of broken from the Harborage link up with Joanna Blueheart's army and start using the guerrilla tactics they learned staying alive on Draenor against the Horde there, butchering them and leaving grisly trophies hanging from the trees in warning, something that Joanna approves of, but maybe an uncorrupted draenei finds uncomfortable.
-When BC first dropped the draenei had racial buffs called 'heroic presence' (for melee classes) and 'inspiring presence' (for casters) because apparently the draenei are so in tunewith the Light that just being near them makes people feel heartened and energized. Why not play with this concept? Have an Alliance regiment somewhere with a draenei priest who acts as a fire-and-brimstone preacher, extolling the virtues of the Light mid-battle and urging them to fight harder, boosting their morale and making them far more dangerous.
Again, I'm just dropping this stuff off the top of my head. You're seriously going to tell me that Blizzard can't come up with this stuff in four years?
None of what I've listed here even bothers with the draenei's sci-fi trappings or touches upon their history with the Legion. These are all potential story hooks that Blizzard could use for the draenei, but don't because either they wimp out or they're too busy Horde-humping - which is why the worgen ended up with the same fate of irrelevence within their own expansion."
I agree with all of the above statements, and this is coming from someone who most exclusively plays the horde. What are your thoughts?