I was born first when my mother was 16, and she didn't have any more kids until I was about 14. There was no father, so the structure wasn't very good for encouraging good behaviour, or any type of intellectual stimulation. I think most people who knew me (very few, since we moved from city to city once or twice per year) regarded me as average or below.
I think that the answer to this question depends on the situation. For instance, children who are born into families that are properly prepared to raise children tend to praise their children more often, since that's the most likely and obvious way to encourage your child to do well in things.
So with this, many children may end up being overly praised, even if they are just average, or even below. I don't think that's necessarily a bad thing; there is no reason to put any child down. But I think there are a few small consequences to pay, such as overconfidence problems and maybe more. Then again, there isn't necessarily anything wrong with being overconfident either.
I wasn't praised very much, and I didn't do well in school for a variety of reasons. However, if you ask me, I think I was capable of achieving average or slightly above average grades had I applied myself. Nothing spectacular, of course; but I would have maybe said above-average.
Hope this answers your question!
(If you're trying to do a survey-type question, this isn't a good place for that-- write a hub and put a poll at the bottom!)