What are you guys getting?
Where is your screen brightness?
I had the same thing when I first installed iOS 7 on another device. It's not used to your usage habits yet. It opens apps in the background that you use at that time ex. if you open mail in the morning at 8, it opens mail at 7:50 so it's ready to go. After a few days, it gets better and your battery improves. Kind of like autocorrect.
Did you actually let the battery die or are you going by the battery indicator?