Heres the problem right here.
The core concepts/features the expansion is based on
1. Kung Fu panda ("Oh didn't we have that one jokey character in WCIII we can bank on? Lets stretch that out for all its worth. I'm sure people will eat it up")
2. Pokemon ("Hey lets just outright rip off pokemon since we don't have any good ideas for this expansion anyways. It's been done before now it's our turn to bank in. People will simply nod and defend us because they are addicted")
Blizzard has just been riding off WCIII story for all of WoWs life. Now it is starting to wear really thin and they can't come up with anything new (that is decent or not ultra generic). They grab ideas from other games and tweak the hell outta what they already have blindly hoping it will be better.
Blizzard just sits proud on their monopoly and know people will eat up whatever slop they pour in front of their customers. They never need to justify or put quality in their products because they will always have an army of fanboys to sustain them and fight battles for them.