I've not found a ton of bugs in iOS 7; some weird behaviors (mostly in older apps) and visual artifacts, sure. Bugs? Thus far the biggest one I've found is the Decline button for incoming calls disappears, seemingly at random. I've had two calls from the same number over the course of a couple of days and sometimes the Decline button is there, and sometimes it isn't.
Of course, 7.0.2 hit just as I was writing this, so maybe it's fixed. Are you seeing it?
Apple iPhone 6s