My concerns are:
1) It was a stupid use of money when we already have Sancho, Pellistri, Amad and to a lesser extent, Elanga, who are young, talented wide right players, that will hopefully improve over the next year or two. If Antony is better than the alternative options, he certainly doesn't look so much better as to merit the amount of money spent. Had it been a year 3 signing after Sancho, Pellistri and Amad had each had 20+ PL starts for United and failed to deliver, then I would have been far more comfortable with spending £80m.
2) The manager was responsible for his signing, which typically means he will get more opportunities than his performances merit. We have seen how this can go horribly wrong, with Solskjaer's insistence on selecting Maguire and Wan-Bissaka even when in terrible form.
3) Is Antony better right now than Pellistri ? I don't the know the answer; one player has been given lots of playing time, while the other has had about 30 mins. Antony seems far more likely to score but creates almost nothing. Pellistri has one assist and put in a super cross to Weghorst against Forest.
4) Antony seems predictable. I fear that PL defenders and keepers will have a good understanding of what he is likely to do. He doesn't appear to have weapons that opposition teams will know about, yet still be unable to stop, such as extreme pace, height, strength, skill etc.