Notification Center has always been a poorly executed feature in iOS since it's beginnings but iOS 7 brings that lack of execution and thought to the forefront.
Yes it looks nicer but functionality actually decreased which shouldn't be the case. The weather widget is now a paragraph. Sometimes you might see the current temperature mentioned and many times you won't. Before it was a consistent experience that gave you temperature and a look to future weather. Now it's become somewhat pointless.
The missed screen make no sense especially since it is just duplicating info that is on my all screen.
The calendar on the today screen can be useful but takes up a lot of space and utilizes it poorly. Why do I need to see a huge block of space that says "no events scheduled?" I also don't need to here about appts the next day when it doesn't tell me what they are.
I accidentally pressed create so this is an unfinished rant but probably for good reason. I guess you can get the idea I'm disappointed in this iOS feature. Don't even get me stated on these not being actionable, non collapsible, and x to clear function.