Just because I find WoD's ending bad doesn't mean the Iron Horde somehow doesn't meet my standards.
But again, when Garrosh ascended to power, there was literally no other option than to oppose the Alliance. Every diplomatic avenue had been exhausted, and it was impossible to keep conflict isolated in Ashenvale, or even Kalimdor.Maybe the Horde wants to be a military juggernaut that doesn't murder children or genocide their enemies. One that isn't focused on conquering the world or opposing the Alliance, but that vigorously maintains its strength without idiotic backstabbing like would often happen in Northrend.
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Garrosh's war was 100% justified. The Orcs were starving, the Night Elves had cut off trade unfairly and every attempt at reestablishing trade diplomatically had failed. Garrosh also didn't stifle the growth or prosperity of the Horde, I have no idea where you're pulling that nonsense from. It was Garrosh who saved the Horde from starvation, it was Garrosh who pushed the industrialization of the Horde, etc. Not exactly "stifling" growth and prosperity there.
With regard to what the Horde wants, it doesn't matter. He was Warchief, not them. The Horde is, by all accounts, a dictatorial organization. The "Blood Oath of the Horde" literally states that members are "instruments of the Warchief's desire." Never mind the fact that Garrosh was beloved by the Orcs, at least.
As far as bigotry goes, look at his allies. Every single one moaned and complained. Vol'jin made a treasonous assassination threat, Baine flat-out betrayed the Horde, etc. How could you not be bigoted against people like that? Especially when your people are required to defend their lands?
Blizzard stated he wasn't corrupted. So long as the Old God isn't revitalized, what's the harm?
They really didn't get what they wanted with Void Elves though. Void Elves are absolute trash and are in no way close to "High Elves." Either way, why would you want these people on Horde? Let them have High Elves, the fewer polluting our faction the better.
Considering they've been releasing art of Sylvanas standing in front of a burning Teldrassil, I'm really not sure what other conclusions you can draw.