They're not rated by anyone except for posters on Arsenal forums, and for good reason.
Bring Back Kerrea Gilbert wrote:
I feel Niles has a lot of intelligence and composure in addition to his top-drawer athleticism. He's also a handy dribbler and passer. He's pretty much the complete package.
I just don't know if he'll ever get a shot in midfield - Jack is far too good not to build it around him as long as he stays fit, and Xhaka is putting in more responsible and dominating performances these days.
Nelson I fear is all hype (his cameo at the weekend was dreadful), but Nketiah looks very, very interesting.
I haven't seen anything to suggest AMN has the footballing IQ to play a good CM. I like his attributes but he's going to add up to less than the sum of his parts. We've seen this time and time again.
Nelson is all tricks and no end product. If things turn out well, he'll be Aaron Lennon Mk II. We've seen players like him before, too.
Have to remember that if you were keeping up with say, West Ham's youth products instead of Arsenal's, you'd think their kids would be hot shit, too. Multiply that x200 and you see how the odds are stacked against any of them becoming useful for us.