I wouldn't say it's degraded to the point of being Windows yet, but it is definitely in danger. Personally I noticed the software quality started taking a dive

I wouldn't say it's degraded to the point of being Windows yet, but it is definitely in danger. Personally I noticed the software quality started taking a dive around iOS 7. 7 was practically a beta. OS X Yosemite was a travesty, made worse by the fact that as an iOS developer I HAD to run it, I couldn't stay on Mavericks like I would've greatly preferred. Yosemite had a lot of good things to add, but at the same time it was plagued with tons of bugs and horrifically un-optimized graphics code (full screen blur with no caching brought my Macbook Pro Retina to it's knees many times). El Capitan has been a huge step in the right direction but I can't help but notice so much of the OS's new features weren't so much optimized or fixed as simply regressed. Additionally, speaking as a developer, many of Apple's API's and SDK's are outright terrible. iCloud implementation for any iOS app is a nightmare, as is using the shared keychain. Then there's the constant obfuscation of the file system on both iOS and OS X which just drives me insane, and the tendency of all Apple apps to operate as if they are the only app you'll ever use for any given purpose, which seems obnoxious at it's best and outright nefarious at it's worst.