The big one, though, is 'multitasking,' and yes, we have our snark fully on with the scare quotes. What Apple is doing instead of 'true' multitasking is offering seven different OS-level services that apps can take advantage of in lieu of actually running in the background: audio, VOIP, location, push notifications, local notifications, task finishing, and fast app switching. To switch to a recently opened app, you double-tap the home button and a dock of your recent apps pops up. When you think about it, it's actually a very elegant solution for maintaining the maximum amount of battery life and speed on a device - albeit by sacrificing certain things.
So why would a non-charitable person call this 'multitasking-lite?' Such a gadfly might point out that the UI here isn't as elegant as webOS; that it requires developers to revisit their apps to add multitasking support; that there's no 'closing' apps because in most cases technically they're not running in the background, they're just frozen and the OS is providing services for them; that there might be background services that developers would want that aren't in Apple's list of seven; that worst of all Apple is making developers spend more and more time on iPhone-only code instead of code that could potentially work cross-platform, thereby increasing lock-in.
http://www.precentral.net/apple-plays-its-multitasking-card-its-no-ace