You have to look at his abilities, imo already better than Fletcher at this age.
Physically imposing at 1.93m, 88 kg.
Physically explosive, have a good top speed and acceleration for his size.
Dribbling ability, he is not a flair player, but he sure does have that explosive style to beat his man.
Strong and rarely lose against other players, physically.
All this is at his peak, and this is his main strengths.
Passing is very direct and simple, can deliver occasional dangerous through pass.
Can be deployed at DM, has a good understanding about defensive roles.
Got great aerial ability, this can be improved with more training.
But that all doesn't matter to me, for me his mental ability is up there with the best, and that will only take him further from where he is now.
So for me, McT will be an important player for us in the next decade and for sure a proper player befitting of calling him a Manchester United player.