I think the orc buildings are in a pretty good place atm. Garrosh's architecture first introduced in Wrath was a welcome change from Classic era sticks & leather (I especially like Aggmar's Hammer), but from Cata onwards it felt too grim. The current architecture we see in Warspear and Frostwall is as sturdy, but less war-emphasized, giving the same feel as the Classic era buildings without being feeble.
The outposts are pathetic, though. They lack character, pretty much feel like template afterthoughts, just enough to serve as the base for your choice of zone buff. Compare them to outposts of previous expansions and you should see the difference. Warspear is built from garrison buildings like the rest, but still has a ton of character.
Now you see it. Now you don't.
But was where Dalaran?
It seems to me as if the buildings in Warspear and Frostwall (The notable exception being the actual base itself; however, it's still a downgrade from Garrosh's buildings), have brought us back to the day of sticks, cloth and leather. There is some stone, but I certainly don't think it's enough to put them on par with the architecture seen under Garrosh.
Isn't Horde architecture just Gazlowe architecture? I assume that he is the one the built Orgrimmar/Warspear/Horde Garrison.
You just lost The Game
I started levelling a Horde character through WoD recently and I'd happily change around the Garrison architecture. It looks like all of my followers could appreciate some Blood Elf or Goblin architecture because of the freezing cold conditions around Frostfire. I think the older Goblin aesthetic could've worked for the Horde garrison but I didn't expect anything as interesting as that.
If I could make a change to architecture it'd be on the Alliance side. It seems to me that the Dwarves should have the highest numbers with the incorporation of the other 2 clans, aswell as the fact that it seems to be humans taking the front lines in most recent conflicts (it seems like this to me anyway, they're everywhere). Coupled with the fact that they're renowned craftsmen, I think new Alliance structures like the Garrison should be of Dwarven design! Mountain fortresses look way cooler than most of what the humans churn out if you ask me, and damn it all if they're difficult to make in the lore.
Most of what I think here is a result of me finding WoW's human aesthetic just boring, especially when compared to other races - even unplayable races. I'm thankful for Shadowmoon Valley and Talador in respect to the abundance of Draenei buildings and I hope Blizzard gives us more opportunities to be immersed in the playable races, less so Human and Orc.
I want some for personal preference. I would be more interested in the game if it focuses on the races I enjoy. It's probably too much to ask from Blizzard to get character development I appreciate, but they're great at producing cool fantasy settings. These settings just get bland when it's human soldiers with ordinary castles, etc. They over-represent the Alliance for me.
Garrosh's buildings were all about stone and metal, so it's a given they were sturdier. I'd still say you're overblowing it by stating we've gone back to sticks, cloth and leather. Looking at Warmill, Barracks, Town Hall, the walls, the Warspear-portal tower and Tavern it seems we've gone to logs and stone, and metal pieces holding it all together. No metal surfaces anymore, sure, so if that's what you're missing the most then I get your point.
Now you see it. Now you don't.
But was where Dalaran?
The only thing Garrosh's structures had more of the current ones was the excessive, resource-consuming amount of metal which covered every single bit of them, plus tons of metal wasted in putting long, massive spikes everywhere to give the buildings a "threatening" look so to satisfy Garrosh's egomaniac obsession that everything in his reign had to inspire "dominion". Nothing more than that.
The current buildings are far less pretentious and much more practical and handy: basis/skeleton made of metal or stone reinforced with said metal, stone as general reinforcement and finally wood/leatherd as ultimate, superficial completion; in the end it does the same trick, but with a design that echoes the pre-Garrosh era. The minor outposts are a bit underwhelming, though (compared to Frostwall and Warspear). I give to Garrosh that despite the atrocious look of his "design" and the embarassing amount of spikes, his input has been pretty much essential to improve the Horde architecture from the times of TBC. I mean, this guy did one or two things decently at most during his reign, let's enlight the merits for once.
Btw I have little problems with the fact that the orc architecture is dominant, I like the design of Warspear in which every race has its hub, each different yet with that bit of orc architecture in it. It works well in respecting every race's identity (the very thing Garrosh always enjoyed to shit upon) while not ignoring the fact that the face of the Horde are and should be the orcs.