Cata started with 12m subs, ended with 10m, a loss of 2m. Mop started at 10m and is currently at 6.8m, a loss of 3.2m, and we're likely to have at least 1 more quarter of losses before WoD. (Unless they have an amazing cinematic that makes people flood back in).
So while people want to rip on Cata, I think it's safe to say that Pandaland was even worse.