Yeah, the new notification center is awful.
I"m using it on an iPad, not an iPhone (don't trust it on my iPhone yet).
1) No clear indication of which part of notification center you're in (just two very easy to miss dots at the bottom of the screen).
2) the notification center widget "edit" mentions left column vs right column, but this has absolutely no apparently meaning. If you're in notification center and rotate the screen to landscape, column do not form. It also doesn't have any relevance to left (widget) screen vs right (notifications) screen.the
3) the "group by app" in settings isn't there anymore (nor the "sort order"). Which are SORELY missed.
4) to scroll through widgets, you have to touch the widgets, you can't put your finger into the margin to scroll. Which, because IOS is so horrible about detecting grab vs click, is prone to activating the widget instead of bypassing it.
So far, the rest of IOS 10 is just "slightly different". But Notification center? HORRIBLE.