I switched back to the Windows ecosystem beginning of this year. I like the polish and reliability of OS X, I think nothing matches the build quality of Apple hardware, but I hate the company's approach to software.
MS didn't realize the value of premium hardware until recently, when they found themselves playing from behind. Now they give guidelines to their OEM's and put out their own hardware as a reference. I don't think Apple will understand the value of software until they lose significant marketshare.
I'm with you on everything you said there. Although I have to use Windows at work, I've been a loyal Apple user for 21 years since I paid over £3000 for my first Mac - the Powerbook 180c (with 640x480 colour screen - revolutionary at the time).
I've seen Apple products improve steadily since then until OSX Lion, which seems to have been the turning point.
Since the introduction of OSX Lion, Apple has drip-fed its users buggy incremental releases of inadequately tested software in both OSX and iOS.
Although this thread is about choosing an operating system, I feel Apple's attitude to customers is also instrumental when making that decision.
Their obsession with 'thinner and lighter' on the iPhone may be fine (although I'd happily have it a couple of mm thicker to provide all-day battery life), but why do they have to make the edge of an iMac so thin just so they can take a publicity photo at a carefully-managed angle to imply the whole machine is wafer thin? Saving an inch of unusable airspace above your desk at the expense of rendering the machine non-upgradable by users is pointless, unless you can charge users twice the going rate rate for hard-drive and memory upgrades.
I was recently lucky enough to be given a very decent Dell laptop with Windows 7 installed. I upgraded it to Windows 8, which was a very smooth online transaction, and I have to say I'm impressed. Windows 8 was designed from the ground up for both desktop and mobile platforms, and it shows. It's simple and intuitive.
Apple tried to make OSX look like iOS, and made a real mess of it. Launchpad on the Mac looks like some hellish version of 'Fisher-Price My First OS', and their implementation of 'versions' has caused a disparity of keyboard shortcuts across various applications.
So in answer to the original question - yes, I have thought about switching back to Windows, ever since OSX Lion.
I'll give Mavericks a chance - maybe Apple have learned from Lion/Mountain Lion, but as 'Maverick' is defined as 'an unorthodox person', the next OS could range from having the charisma of Steve Jobs, to the unpredictability of the weirdo who sits next to you on the late-night bus.