DO NOT UPGRADE! My windows 10 upgraded this morning and ams ran shocking... Tearing graphics, no aa. Did a little search and it's a known problem. I had to roll back to the previous windows 10 version and thankfully it's butter smooth again!
TBH it's easier just to roll back windows...i don't know if it would have effected other games. does anyone know how you stop windows updating as i really do not want this update !!Using Inspector you can assign an AA compatibility mode which allows you to return to full screen with full AA options. I thought I had eye cancer when I first fired it up, something felt way way wrong. Then I realised the multi view wasn't working properly, no v-sync and certainly no AA. There is a thread on Reiza forums that helped. Check it out.
This update is mandatory, you're going to get it sooner or later. Rolling back is just postponing the inevitable.