It feels like Legion 0.5 where they mostly share the same features but also make them worse. The new features (allied races, island expeditions, warfronts) ended up very lackluster while they all had great potential to shake the game up. Most content isn't fun to do, and the loot system is all RNG now. Hopefully the major patches will patch up the game that it badly needs. So far I'd rate every expansion from best to worst:
1. WotLK
2. TBC
3. MoP
4. Legion
5. BFA
6. WoD
7. Cata