Cataclysm featured no new classes, no new professions (Archeology doesn't count), and more shallow trees rather than deeper trees. The only content that they gave us was Aesthetic -new zones and new races, but nothing ~Different~ to do in them.
I don't know why anybody is surprised at the results of this xpac. I like WoW for years, but this xpac bore me the most. So many changes went into play, which actually made the game feel worst.
for example, the change that Blizzard made to the PvP zone, right before CAT patch, was a huge killer blow to the players that enjoyed that kind of gameplay from WoW in WoTLK. Now I have to wait in a queue, because my faction has two big of a population. That's a 2+hour wait here people,,, just to do something I may enjoy. The talent trees were made even more shallow.
also what was the point of making brand new zones over the other Vanilla WoW zones, if these zones have no effect at all on max level characters. Most of the new map was for LOW LEVEL CHARACTERS!!! they could have at least added a Level Scaling feature to the game, so high level characters get some kind of enjoyment out of the new lower level areas.
also CAT was suppose to be about the War between the HORDE AND ALLIANCE, yet were are the improvements to the PvP? The new Battlegrounds felt more like revamps of older BattleGrounds rather than the new deal.
new races are nothing when you have nothing new to play with them. Hasn't Blizzard learned this by now from TBC? come on!!!!
Blizzard added nothing new.
it's pretty common sense here. CAT failed because the developers got complacent. If you not going to add anything new with the game, then yeah, they're going to lose millions of Subscribers.
just as well, anyway. Guild Wars 2 looks amazing !! Maybe Blizzard should have copy Anet, now with MoP, or in the near future.