Second sentence, not so much. I don't know which fans you're referring to, so I can't accurately counter that, but I do personally think McAtee is a very special young talent capable of great things. I think he's better than absolutely loads of young attacking talent we've had over the years. Foden level? Maybe not, but easily as naturally gifted as Palmer, and I think Pep is spot on to have him around the team.
That's vaguely where I rate him. There's this idea I keep reading that he's "the next David Silva" and a guaranteed future first team player and he's just not that for me. He's a promising young player who could go into the squad or could end up at Southampton in 3 years. But I'm around that with Palmer too though I think he's ahead of McAtee. There's a long way to go for both of them.
Pep has a way of making young players look better than they are because he's so systematic. I remember after he left Barca, there were a ton of next big things that looked half the player that they did when Pep was starting to give them minutes.