They'll talk about how Apple adds things that their products should have launched with, while ignoring how these gradual upgrades allow for pretty much seamless experiences, no crashes, great integration with iTunes, etc.
I'm sure people will complain it's not "real" multitasking. It just lets you inject code into blessed background services.
People want their solitaire app to shrink into the background, UI and all, using up tons of the tiny available RAM, and requiring a Task Scheduler to kill stuck processes.