The sad thing is, Zynga knows how to run a game as a service. They have the engineering down to a science, and a launch like this would never happen for them. For starters, they would have done continuous internal beta testing, had a soft launch that would have caught these issues, and have actually engineered their cloud servers to scale, rather than act like individual WOW shards. Actual WOW shards are run across on multiple scalable servers, I should add. Blizzard also knows what they are doing.