- Less than half the subs at the time TBC launched bought the expansion in the the first month. (8 Million Subs, 3.5 Million sold)
- About a quarter of total subs bought WotLK in the first month. (11+ million subs, 4 Million sold)
- Less than half the total subs bought Cata in the first month (11 million subs, 4.7 million sold)
So no. Sales of MoP are almost perfectly in line with sales figures from previous expansions. Quit looking for bad news where there isn't any. Or to put it another way, a lack of record setting sales does not mean the sales numbers are disastrous.