You caused your loss and don't put the blame on Manchester United because if you did your analysis proper based on United past performance, you would not give them a straight win or bet on them to win the match. I have stopped betting on Manchester United for long until, I see that they have really improved. I don't know what's wrong with this club in particular, all efforts made to improve the club performance seems not working out.
Was there really any point in betting on 1.15 odds for a Manchester United win? I think it was pointless anyway, even if they had an easy victory. And before the match, you could have just looked at the starting lineup that Amorim set for this game. Even without considering that this is a lower-division team, it’s still a cup match, and who knows how the team would prepare for it? Of course, Manchester United was supposed to beat Grimsby easily and confidently. This loss only shows that Manchester United’s problems haven’t gone away.