It's really, really good and a fresh take from both BFA and SL. It doesn't feel too serious and nonsensical like Shadowlands either. It feels like they put WOTLK's zones, MoP's elements and atmosphere, and Legion's questing and stirred them together. I'm glad the only thing close to a system is Dragonriding and I love it almost more than flying. I do however felt some storylines like in the plains dragged on for too long or weren't as strong as the other zones. So far I give the expansion an 8 or 7 out of 10. I'll have to see the end-game's story, mythic + and raiding to give it a stronger opinion.
How about you?