Only three who made it were good enough. Pogba and Pique never made it here, and neither did Rossi, so no point on mentioning them. For what is worth, I think that Pogba and Pique have been the best players in our academy since Paul Scholes, but we never got any benefit from them. I would put Rossi just below Fletch, so around Brown/O'Shea level. And anyway, all three of them were poached from other clubs, already having a name for themselves, and their previous clubs contributed more to their education than United.
Welbeck was never United level, or close to it. He was a manc though, which is all that matters for many people. He was a good athlete who was average or below average in pretty much every aspect of football. Lets not even talk about that waste of space, Cleverley.
The other problem is that where is the point on giving that many chances to players who aren't that great. Take Fletcher for example, which as I said, I consider the best from our academy that made it here (since class of 92). He was absolute dogshit for many years, and even at his best wasn't as good as Carrick, who isn't world class himself. Or take Evans, who 'made it here'. In most of his career here (bar the debut year and the last year under SAF), he was atrocious. Where is the point on giving those many chances to these players, considering that even the best of them, just make an okay level after many years of being shit and the team suffering in process.
I have said many times that our academy needs to completely change, because as it is, it is more hindrance to the team, rather than benefit.