I don't honestly understand how people are putting MoP > TBC in terms of less lore or something. TBC was basically "
heres a bunch of random stuff you thought was cool from WC lore on another planet! IT DOESNT HAVE TO MAKE SENSE, ITS a shattered realm". Or something.
MoP had Pandas. Honestly. I like bear people. I don't care if theyre pandas. They're just bear people.
The entire MoP expansion had more content just about Pandas than any single event in TBC had about any info it ever wanted to give.
In my opinion, the only way to argue MoP had less lore, is to just assume you started playing after TBC in which you would have no way to understand that from levels ~58-70~, there really wasn't much story progression in terms of lore. Quest, yes, but actual lore that affects the timeline of the game...not really. You were just there killing stuff because somehow Kazak opened up the dark portal again using a mysterious artifact he just found. Despite this artifact powering the portal again, you're never really told what it is or how it works...or why it was there in the first place