Agree 100%!!
It's a nuisance. It should be one way or the other, with a user option to change how it behaves.
The inconsistency is maddening--plus, in the middle of the night, I do not want to be reminded what time it is!
At first, I thought it was iPad Air specific (with iOS 7), but our iPad mini with retina also sometimes does this. By contrast, any device with iOS 6, behaves properly -- no flash, no time, no lock screen--just instant return to where you last were!