Let's give merit we're it's due, personally I watched that game from start to finish, let's forget United are a top tier team for a second 
and admit Grimsby looked like the team that needed it more and from the onset they pressured Utd more and justed looked more determined to get that first goal which they did...
Btw whatever rivalry happened some several decades ago seems to have been renewed, when I heard the commentors say United haven't won Grimsby before I knew United will be f@##&, and at this point clearly Amorim looks like his experiments aren't working even when he has the players...let him stop the nuisance of favourite players and field players by their strengths.
Amorim change your playbook ASAP!!
and admit Grimsby looked like the team that needed it more and from the onset they pressured Utd more and justed looked more determined to get that first goal which they did...Btw whatever rivalry happened some several decades ago seems to have been renewed, when I heard the commentors say United haven't won Grimsby before I knew United will be f@##&, and at this point clearly Amorim looks like his experiments aren't working even when he has the players...let him stop the nuisance of favourite players and field players by their strengths.
Amorim change your playbook ASAP!!
Whatever left of such rivalry I'm sure it ended in the 60s, not a single Grimsby current players and fans came with that mind set yesterday. United were beaten tactically in the first half in every aspect of the game.
Since Amorim took over, United has been poor, but I didn't think they would be just as poor against a team in the lowest division league. Since there should be no justification for Amorim's failure to improve the team's situation since his arrival, he is solely responsible for his problems. Since the 3 at the back hasn't worked this season, I thought he might try a different formation @against Grimsby, but he stuck to his boring 3-5-2 formation.