I think Wilshere's performance against Barcelona, having just turned 19, was as remarkable as any performance Fabregas put in at the same age, and superior to anything Rooney or Ronaldo did at that age.
I've literally seen one game of Chamberlain, well, one more last season, too, but I wasn't really paying attention, and I'd say the kid is about as exciting as I've seen in this League from one so young. Will wait until he's doing similar things in the Premier league, but he's so explosive and exciting, it seems he can do anything, reminds me of Ronaldo when he burst onto the scene. I think it's his confidence and cockiness that seals it for me, it's so rare at that age, he's just ready to go, Rooney and Jack were exactly the same.