I've been a Mac user for 20+ years now and an iPhone user since 2007. Quite frankly, the hardware and software has never been better from my own experience. Go do a Google search and you'll quickly find that every new software release Apple has put out is "the worst ever." Same goes for hardware. Every time Apple has had a keynote, there have been torrents of negative reactions about how they're losing their way and going downhill. "No wireless. Less space than a Nomad. Lame." Remember that?
- MobileMe (2008): outages for days at a time, push services not working, and a formal apology. Keep in mind, people were paying for this service.
- iPhone 4 and "antenna-gate"
- Mac OS X 10.2.8, which killed networking entirely for a lot of users and was quickly pulled (this was 10 years before iOS 8.0.1)
- The Snow Leopard bug that wiped all your user data.
- iPhone power adapter prongs breaking off (2008)
- The hockey puck mouse
Those are just a few. The point is, over all Apple's QA is improved dramatically. The problem is that the iPhone is far more popular than anything else Apple has ever made. It's not that the software has gone downhill; it's that there is far more scrutiny on it -- particularly in the media. "It just works" is truer today than it ever has been.