I like most of it, to be honest. Goblin stuff is wacky and haphazard, Gilnean architecture is beautiful and haunting, Suramar is beautiful with flowing lines and arches. The WoD Draenei architecture is gorgeous, and even the Human garrison is really quite nice. Dalaranian and Pandaren styles are some of my favorites, with Dalaran's stuff having more "magic meets old-fashioned urban" and Pandaria's being more comfortable and down to earth.
I'm not a big fan of Orc, Tauren, or Troll stuff. Forsaken is kinda meh. Vrykul isn't bad. Nelf is alright. Silvermoon is very pretty, but outdated textures and such.