Android multitasking... which is not true multitasking, but pretty close, blows. I can hit the home button out of Bad Piggies, for example, on my GS3 and many times Watchdog will pop up saying it is using a lot of CPU in the background.. WFT? The Endgadet app on Android is another example of an app that goes out of control on Android. Has since it was introduced. That type of multitasking is unneeded.
You guys can probably think of more examples, but for me, the biggest things that need to "multitask" are:
(1) VPN Clients - no need to explain this one..
(2) Background audio/music - ditto
(3) Third party email clients - Good Mobile Messaging is a good example. On iOS obviously the app only runs when you are in it. This means if I get 50 emails, they will not appear in Good until I launch the app and sit and wait for them to all download. Also that means that it will not notify me of calendar appointments unless the app is running. (Yes they use the push network for calendar, but that requires the internet.. something a tablet, for example, might not always have.
(4) Maybe things like VMWare View so it can maintain a connection when you are not in the app....
Those are the big ones I can think of, I'm sure there are a few more. I do not want the Android model... it's not the best.