@Will
For more than one reason too. Seriously: Microsoft has made the Internet a more dangerous place to be on, and caused a lot of collateral damage with this enforced update stunt. At least that's my opinion and impression (based on what I saw around me).
Thing is: many people have been thrown offguard and are now very suspicious of the whole upgrade procedure and tons of people I know off have forcefully turned off updates in order to prevent an unwanted update to Windows 10. Thing is: it's a whole lot easier to simply turn off the update process entirely than it is to track down (and block) the updates responsible for the Windows 10 update. I know there are 3rd party tools for that, not my point.
My point is that there are now plenty of legit Windows environments out there which won't be updated any time soon because the owner is fearful of being forcefed with Windows 10. Yet that also creates a risk because they also won't be getting any more security updates either.
Considering the massive amount of stories about exploits and discovered flaws I hope that it won't be too hard to comprehend why this could become a major problem. Sure... Unless you're not on the receiving end of a DDoS attack you have nothing to complain about, right? Yah, but what if you are and you didn't use any intervention from, say, Cloudfare?
When are we going to stop fighting symptoms and instead try to tackle problems at the source, like this one?
For the record: I'm a Microsoft fan (sort off), I seriously enjoy and appreciate some of the products (like Office and Windows 7) but I'm very opposed to their <self-censored> idea of enforcing their Windows 10 crap upon us.