I feel like this topic is getting a bit repetitive, but wanted to take a moment to say that you do bring up a very good point, about it's not like Blizzard sets out to make underwhelming features.
Fair point; I take that one on the chin.
So, I suppose I'll elaborate on what I think the issue with Garrisons was.
See, *I* feel like it was designed by people who didn't really "get" the appeal of Player Housing, but they knew it was something players had been demanding for years. Whether they were genuinely excited about what they designed, or whether it was just "ticking a box" for them, I think the ultimate product was simply misguided.
"Housing" is kind of a nuanced thing to discuss, but I'll try to frame it as best I can, if only so those who don't see the point can at least understand what it is we're looking for, and where we feel Garrisons missed the mark.
Garrisons were "your house" only in the sense that they were places that your character *technically* owned. But you got a singular location (based on your faction), with a couple of interchangable buildings. The buildings themselves couldn't be customized, and retained the same uniform art-style of your faction (which was either Human architecture, or Orc architecture, both of which many players had been sick of looking at anyways).
Now, I'll say this; being able to acquire Music Rolls, and change the Guards to a different race? Those were nice touches. And the Halloween and Christmas decorations, while they were pretty minimal, at least showed promise that "Hey, maybe Blizzard is catching on!".
However, generally speaking, one person's Garrisons was virtually -- if not *literally* -- identical to another's. So there was no "pride" to be had in your Garrison, nor was there really any sort of exciting means of "progressing" your Garrison. Even the "Trophies" you could acquire were locked to three individual locations, and there were only a handful of different designs, none of which made any sort of impact on the visuals of your Garrison.
Now, the reason many players HATED Garrisons were because they had the dual effect of being *INCREDIBLY* useful. I remember there was a time when sitting in my garrison was literally more productive than actually raiding with my guild, because we kept having trouble with certain bosses, and Garrisons provided an easy (albeit random) means of acquiring better raid-gear. In addition, you could gather all your resources (including resources you didn't actually have gathering skills for), all without ever leaving the confines of your Garrison.
In many ways, I think it would be fair to say that Garrisons were quite literally the opposite of what a proper Housing system would be; cosmetically unique, and purely optional.
What makes "Housing" so appealing, is it gives you a means of sort of "showcasing your personality within the game". Not unlike Transmogging, to be honest.
Chances are, most players would wind up with a hodge-podge of items, and just lay them down willy nilly. Here's one such example:
https://twinfinite.net/wp-content/up...iv-housing.jpg
But, maybe you decide "Actually, I want my character's house to be something cool, like a safe refuge":
https://66.media.tumblr.com/089b711e...1to10_1280.png
Or, maybe you think "I want my place to be a fortress, that showcases how BADASS my character is...":
http://www.csartcolorado.org/cdn_bl1...decoration.jpg
I mean, just speaking purely for myself?
I kind of like the idea of creating a gothic, frozen keep for my Death Knight. Maybe I would have to spend a lot of time farming dungeons and raids in Northrend, eventually acquiring a "frozen throne" of my very own. Or maybe for my Rogue, I would try to go for a more "fun" sort of ribe, with bright neon lights and kind of a Carnival theme from Darkmoon Faire. Or maybe for my Hunter, I would go for kind of a "tropical tiki-bar" sort of vibe.
Point is, those choices would be at my discretion, and taking the time to pursue them would hopefully make mine stand out. In addition, it would give me "stuff to do" again. Like I'm sure many other players, I've collected so many Transmog sets, I honestly doubt I ever need to go out of my way collecting gear ever again. As far as I'm concerned, Blizzard still hasn't topped the Blue Scourgelord (DK Tier 10) set, and the only close contender would be the Mythic Dreadwyrm (DK Tier 19?) set. And I can't solo Mythic Nighthold, so it doesn't leave me with a whole lot to do, nothing I'm *excited* about doing, anyways.
But going through all the many Raids and Dungeons WoW has, going after specific items I think will match the "theme" of the house I'm trying to make? That's something I would deem "exciting" and worthwhile. It could also prove a great way to get players like me inspired to actually start Raiding once again, by making some *REALLY* cool house-items (I actually haven't done a single Raid, not even LFR, this entire expansion, and zero interest currently). Maybe do things similar to Mounts, where "current" content has greatly increased (like 50% or higher) droprates for cool house items, but once the next expansion releases, they drop it all down to 1%. That would give me a real push to at least keep up with raiding, even if I was never on the bleeding-edge again.