I think ben foster is being overly harsh and I completely disagree with some of his points (feck knows how Jones is to blame for the penalty conceded against Arsenal) but I agree with the general point that Jones hasn't exceeded expectations.
I don't think every 19 year old arrives at the same club with the same burden of expectation for starters. Jones cost a lot of money, was highly sought after and talked up massively by, amongst others, Sam Allardyce (who compared him to Essien) and Gary Neville (said he was nailed on as a future England captain)
Personally, I expected someone who would be a solid, resolute defender but who wouldn't add much to our attacking football. I've been impressed by how good he is going forwards but generally a bit underwhelmed by his defensive displays. I certainly think, for example, that Jonny Evans was a better centre-half when he was the same age that Jones is now.
Has he surpassed my expectations? Not really. He's a talented young footballer who is a work in progress, as expected.