OK, first things first.
Windows 10 is pretty much an OS mixed with an abundance of adware and bloatware. There is no way around it, it has been proven ages ago. This however doesn't fully explain all the issues people seem to have when upgrading from Windows 8 to 10. I would guess it boils down to incompatibility in certain files going from W8 to 10.
Coming back to the adware, it seems Microsoft uses the ad revenue to cover costs of developing the OS. Its a really <censored> way of getting money off of us, but I can forgive them for it. I however CANNOT forgive them for ALL the "spyware" they have built into the OS, and of course a couple of other things. Listing them below :
- An excerpt from the Terms of Use :
"We will access, disclose and preserve personal data, including your content (such as the content of your emails, other private communications or files in private folders), when we have a good faith belief that doing so is necessary to."
Need I say more?
- Cortana proves problematic because it has access to your camera and microphone, and more importantly, it has access to your contacts, calendar, and probably all of your documents.
- The new Edge browser has its own share of new problems. Its integrated PDF and Adobe Flash reader has raised some alarms at Trend Micro. Trend is also concerned about the support for asm.js, a JavaScript subset from Mozilla that has been attacked before. Oh and it has personalized ads.
Again, almost all of the spyware CAN be disabled, but there is NO guarantee that it will stay disabled. So basically it boils down to something simple.
If you are one of those who believe that Microsoft and the US government are out to get all your information illegally, and that its not OK, do not install it. Stick with Windows 7 if you want.
If you are one of those who already has resigned to the fact that the government already has/will have your information, then nothing should be stopping you from upgrading to Windows 10. I would however suggest weighing the risks it carries, what with the issues people face after upgrading.