Windows 10 is actually quite a good operating system!
Windows 10 is actually quite a good operating system. It is different to previous versions of Windows and people are naturally resistant to and suspicious of change.
It is true that some older or very new computers may not have the necessary driver support for some features on their machines. That has also been true of every version of Windows and other operating systems.
With this version of Windows, Microsoft has written an operating system that is capable of working across a wide variety of platforms, desktops, laptops, tablets, and mobile phones. Data can be exchanged between these devices and viewed and edited in its' native format. All very useful and convenient, particularly for commercial users that form the most profitable part of Microsoft's market.
Like any new software, there are bugs but they will be fixed eventually. There may be concerns about the amount of data that is collected by Microsoft, but their main concern is using this data to target adverts and otherwise obtain a commercial advantage over competitors. It really isn't a giant data gathering exercise for the NSA or other organisations. They have sufficient resources already to scoop up everything they need.
The forced upgrades may appear underhand, but by ensuring the maximum number of systems are using the same operating system, it is far easier to provide support, security upgrades and reduce costs. Microsoft is a business trying to maximise profits for their shareholders when all is said and done.
No point moaning about it. Windows 10 is going to be the de facto operating system in the commercial world for the foreseeable future. As with all progress there are winners and losers when it comes to whether this update actually improves the performance of your computer system. The fact is, the vast majority of users are happy with Windows 10 once they get used to a slightly different way of working on the computer.