I notice that most of the focus in this thread is about iOS devices, which is fair enough as they're now Apple's main source of income. For me, the iPhone 4S more than serves my needs, and will probably continue to do so for quite some time. I refuse to be convinced that every new application of technology is something that is desperately missing from my life.
My biggest bugbear with Apple, having used their gear since my 1993 PowerBook 180c, is not that they're 'slipping behind Samsung', it's that they're becoming sloppy in their quality control, particularly in Mac OS. When importing audiobooks from CDs, iTunes shuffles the order of the tracks to the point where it can take a couple of hours of manually renaming each track to persuade iTunes to play them in the right order.
The combination of key-presses for 'save as' differs from application to application, ever since the ill-thought-out implementation of autosave. I particularly found it distasteful that they charged me for removing 'save as' in Preview when they introduced autosave in Lion, then sold it back to me as a 'new feature' with an extra key-press in Mountain Lion when they realised autosave wasn't as universally popular as they expected.
I've seen Apple go through mixed fortunes in the past 20 years, and when they're on a high they become aggressive and dictatorial. There are many companies that have got themselves into problems by producing things they want to sell, rather than what customers want to buy. Jobs generally got it spot on, but I see a grim future for Apple with their current MO.
A desktop computer (iMac) with no user upgrade options, forcing grossly overpriced memory and hard drive upgrades?
iPhones boasting a myriad hi-tech features that have to be switched off to allow the battery to get through the day, all because of Apple's obsession with 'thinner, lighter'? Make the damn thing 1 or 2mm thicker and let us use these functions they brag about. And did customers really struggle with the weight of it?
And industry standard bluetooth that won't talk to other bluetooth devices?
To me, Apple are on a low right now, obsessing about controlling the user experience and the mobile universe in general, litigating against the competition, and forgetting about what took them to the top: innovation, quality, and providing the customer with what they want.