Really?
Jade Forest is a lush green locale, very peaceful, lots of classic asian-style structures.
But then Krasarang Wilds is a dense jungle opening out on to a long golden beach.
Then you have Kun-lai, which is a cold, almost Northrend feeling place with a huge beautiful mountain. Lots of barren land too, feels like a harsh place to be.
And then again, Dread Wastes is a dark twisted bug infested place.
That's quite a lot of variety.
Well, compare that to Cataclysm.
Vashj'ir - underwater zone, with spawling colours and sealife. Completely different from all other zones so far in wow.
Uldum - Desert with egyptian and titan themes
Mount Hyjal - Mount fucking hyjal, where you are pretty much fighting agains ragnaros' forces and the twilight's hammer
Deepholm - The earth elemental plane, imo the best looking zone in the game.
That last zone was shit though.
As for the MoP zones, you clearly have your oppinion on them, but let me say what I feel about them.
Jade Forest - The only actual good zone in MoP, can't disagree with too much of what you said. I also like it because it's the only fucking zone in MoP that delivered on the horde vs alliance thing that blizzard advertised as being the main focal point of the expansion, due to the lack of an atagonist such as arthas and deathwing.
Krasarang Wilds - This zone is boring as shit, it feels like a slighty darker version of STV, visually. The quests and stories in the zone are boring as can be, you kill some animals, cleanse some sha, and help some old NE ( if you're alliance ) find some magic water...
Kun-lai - You say it's a northrend feeling place with pretty mountains. I say barren, brown and yellow zone with the most boring quests in the expansion. I imagine blizzards thought process was something akin to "okay guys, we need another asian feeling zone, lets do tibet!" with no one having the realization that tibet is a dull fucking place with a lot of nothing
Dread Wastes - Interesting concept, but the fact that it looks like a re-texturerized version of townlong steppes, it just comes off as lazy at first glance. Doesn't help that I find the klaxxi extremely ugly and boring either.
I know that's not really objective analysis or anything, but that's my honest to god feelings about those zones. Not like I bought MoP wanting to hate the zones either...