I'm really impressed with Windows Update. Microsoft does a great job of getting patches out quickly to my home machine, easily installable. But they have one really annoying bug: some part of the install process often steals keyboard focus. I'm installing the last set of six patches, which takes about 3 minutes, so I'm typing email. Halfway through my typing bam my keyboard goes dead. Presumably underneath the scenes some part of the installer mapped a window which took focus, then didn't give it back. That's dumb.
Then again, they are getting better at pushing updates so they don't require reboots.