It's obviously subjective but as i said, both the animated series (Lords of war) and the WoD Cinematic were done quite well.
I think people underestimate how much that stuff can have an impact on the initial subgrowth, it's arguably one of the reasons why MoP had barely any growth, because Pandas and stuff just didn't resonate with people as much as the themes of WoD did.
And as a reminder, WoD was literally the first expansion they marketed with an animated series, Legion, BfA and SL only continued that.