I would agree on this, with a few remarks.
Lingard definitely not good enough, and at the age where you can't believe he will improve.
Pereira - to be honest this is his first season in United with regular first team chances. He was bad in majority of games, but had some good ones, especially Chelsea home (first game) and Liverpool home. He is good defensively which is pretty weird, had energy, and definitely can help when playing with better players around and when you don't expect miracles from him. He can't lead. With pretty small contract comparing with others, I would keep him around for a year or two, and than replace him with someone from Academy, or signing from abroad. We can't add 5 midfielders in the next few years and we will be without Lingard, Matic, Mata and potentialy Pogba in a year. I expect that he will be a squad player next year, replacing in some games Bruno and Pogba, and having some sub performances.
James - for me, he was excellent this year. Much better than I expected. Yes, he had bad games, in one period he was obviously not good enough, but I will take in account a few things that certainly did not help him. As we had a lot of injuries, James was fit all the time and had to play much more than anyone expected. He had terrible personal situation at the start of the season, that is very difficult to overcome. This is his second senior season, and the first one in PL against top opposition. So, honestly, I am not sure what you expected from the lad, but for me he was very good, very brave, willing to do anything for the team. Yes, I agree, he has flaws, especially against teams playing deep. He needs space to run and use pace, but he is 21, he can develop with good coaches around and to me, he looks like a kid willing to listen and do anything coaches want. So, lets see what he will bring to his game in the next 12 months, with coaches around, good preseason, and with some time to rest between games, and not playing every 3 days for 70+ minutes. Based on what he showed this year, I think he will stay with us for next 10 years and become really good player.