There are some zones that I would call a success and others not. Thousand needles was previously def. better, redreridge mountains on the other hand is freaking incredible, I guess you played it too? 10/10 can really recommend

It is kind of like an action movie.
I am probably being wrong and it is what is the most obvious which is avaloren and khaz algar, but I think the game desperately needs a revamp visually, level design wise and especially new player experience wise. Currently it is total chaos after you leave the new starter island. If they want to go for another 10 years, they need a solid plan and evergreens. I am not sure if this plan can be to always add new islands and landmasses and leave the rest in ruins. Also think of things like client size and so on.
The problems with "wasted" zones in cata is no more since they improved on world content like world quests and missions and so on.
Another thing is you need to stay iconic. For example blood/high elves. You dont want to add more "noble" "elven" creatures who think they are the best. I mean, you could but then you devaluate the work youve done already. They also don*t want to add more "paladin"-like races and factions. You can totally start over in a new game in a new art universe but warcraft exists so long that certain directions in art and theme are just "set".