The setting. Draenor before it was the shattered husk known as Outland. A world of unparalleled beauty, with a thriving population of Draenei before they were wiped out and their works left in ruins.
Music was great, though that can be said for many expansions. Did you see how many doodads were added in WoD? Tons! The graphical update didn’t do my male Night Elves any favors, but it worked wonders on my other characters. The Garrison, when not viewed as a replacement for Capital Cities or player housing, are still to this day a wonderfully aesthetic and utilitarian feature for player use.
The greatest failures of WoD are not just the content drought, but also the aborted main campaign storylines. The loss of Shattrath as a useable city, and that terrible rewrite that had Grommash saying that infamous line. Also the multiple garrison locations that were scrapped. Admiral Taylor getting ghosted off screen, etc. I still remember the leaked dialogue from the Steam Tank event. Yrel’s development was horribly rushed about halfway through, and so much more.
Take a character, whether an unleveled alt, or even your main if you want. And go play the expansion for the couple days before the next expansion releases. Go see what you’ve missed out on, and only heard about it being bad. Even if you played it when WoD was live, it can be worth it to relive the experience. I did, and even though I quit around the Selfie Camera patch, coming back was one of the best experiences I’ve had in WoW in recent years. Take your time, explore the world of Draenor, find the hidden areas and secret locations.
If you pay close attention, you’ll notice when things went off the rails in regards to development. When they cut the expansion short, rewrote the story, and sent the teams to go focus on Legion instead. It’s a shame, as WoD had SO much potential. If that’s not your jam, consider talking a slow walk through Boralus in the BFA zone of Tiragarde Sound. Under the leafy canopies of Zandalar’s jungle, or whatever else would suit you.
The latest and greatest(supposedly) isn’t always where WoW shines.