Since (I believe) Windows 7, Disk Defragmentation occurs automatically now so as files are loaded and installed, the system is always optimizing the disk space to allow for easier access to files so the system won't get slower. Plus SSDs are faster (though they lack available disk space) so it's not going to affect the system that much when updates are applied.
The MS Store is useful and has a variety of apps that are unavailable on every other operating system that Microsoft has since released but these are optional. I personally found quite a few apps and games that my 4 year old can easily play and I found some great apps for music videos and movies. The tiles themselves are not useless for people who have a touch screen, that's ridiculous. They provide an easy way to sort and organize your most frequently used programs for one-touch/click launching.
And when has Microsoft ever released an update to indicate they can remotely manipulate your PC? Do you have a KB update number for that? I think you have it backwards. Microsoft puts out updates to PREVENT unauthorized access to your PC via backdoor programs.
Plus even though Windows 8 had a push towards tablets and laptops, it's still very functional on desktop PCs. I custom built my own home desktop PC for Windows 8 and there's no restrictions for me - nothing I can't do that requires just touch input. People just misunderstand the operating system.