Agreed. I've left Windows Update completely off since the first appearance of GWX. So how exactly did I get an unsolicited 447-megabyte installation of Silverlight 5.1.50428.0 on August 6? I still run Security Essentials scans every so often, and I allow to update its malware definitions each time. I'm guessing that's where the Silverlight installation came from. Must be one of those "malware definitions."
Clearly a monthly rollup is the right thing to do, considering how long it takes to bring a new Windows installation up to speed. But given their track record, I'd be crazy to allow Microsoft to make changes to my system that can't be rolled back. It would be different if I could trust them to act in my interests in addition to their own. Instead, the continuous stream of lies and incompetence we've seen from the Windows Update team over the past couple of years, including a number of "bugs" and "mistakes" whose effects suspiciously seem to accrue exclusively to Microsoft's benefit, have made it inadvisable to do so.
It's not the policy that annoys me, it's the bullshit.