I've been largely happy with iOS7. My iPad2 and iPhone4 (my default iPod now) now run much, much faster than they had been running and my iPhone5 (my phone) is even better than it was before. Too, as Maurice
pointed out, all three now work nearly perfectly for the things I use them for, which is just about all I can ask.
FYI: Late last night, Apple put out the first update on iOS7 too, to fix various bugs -inluding the lock screen hiccup issue.