Update via App Store takes 5 hours to download 215MB

After waiting over 5 hours for the Software Update part of the App store to download a Safari Update and 2015-004 Security update, the bloody thing says they're both corrupt and won't install.

I downloaded the Security Update directly from the download part of the Support site, takes 5 MINUTES. I install it.. but the stupid App Store says I still need to download and install it via the APP Store?

Apple, you're REALLY not making this a nice experience with this crap. In fact, it's EASIER to update Windows these days.

<Edited by Host>