The Frenchman, who United spent an initial £36million on in 2015, failed to impress once again as the Red Devils found a way to come from behind against the Saints.
After scoring against Liverpool on his debut, Martial hasn’t necessarily lived up to expectations and scored just four times in the Premier League last season.
Mason Greenwood netted his second goal in United’s two opening games to earn Ole Gunnar Solskjaer’s side a point on the south coast, and the youngster is one of a number of forwards Martial is battling against for a spot in the United starting XI.
Greenwood, Marcus Rashford, who is currently out injured, Jadon Sancho, Edinson Cavani, and Dan James can all play similar roles and, after Martial’s performance on Sunday, he may struggle to get another start under Solskjaer any time soon.
O’Hara agrees and, as well as criticising United’s display at St Mary’s, he singled out Martial for his ‘hocking’ performance.
“I thought Manchester United were actually really poor,” the former Tottenham midfielder said on talkSPORT Breakfast.
“They were so sloppy in possession. In the final third, when they got in key areas, they just didn’t make the right pass.
“Paul Pogba, I thought, was fantastic. He ran the show. He was an absolute class act.
“He just plays like he’s not bothered whether he plays well or not. It’s a weird attitude to have.
“When I used to go on a football pitch, I was just obsessed with trying to be the best player out there.
“Martial just plays like he doesn’t care whether he’s good or not. It’s just it’s weird how he plays because he’s got so much talent.
“But it’s not good enough, he’s miles off it when you compare him and Lukaku, they’re just worlds apart.
“I was disappointed in Manchester United. If you want to be title challengers and think you’re going to win the league, you got to go and beat Southampton.”
The outspoken talkSPORT pundit said: “I’ve looked at him over the last two or three years, objectively, and thought if you play him as a main stay, you’re never going to achieve very much.
“He just simply doesn’t have what’s required from an elite Manchester United side to put the fear of God into the opposition and deliver on a week-in, week-out, basis.
“If you can manage him as part of a squad and he isn’t a problem behind the scenes, then he’s a wonderful part of a squad, but I don’t get that impression it’s what this boy is looking for.
“I think United’s story has moved on from Anthony Martial and I think the problem for Anthony Martial is how does that manfest itself for him?”
“Yes, he’s got bags of potential. So did Memphis Depay but they don’t deliver it at clubs like Manchester United because the expectations, demands, and the stage they’re playing on is far more monumental than anywhere else.
“To me he is the embodiment of footballers who have an inordinate amount of talent but simply don’t have the psychological application or the innate strength required to compete at that level and not be a key component of Manchester United’s team.
“Then you have the disillusionment of not being a key component because they have moved on a little bit from there and he’ll perhaps become a disruptive influence.”
Former Liverpool star Danny Murphy was less scathing about his ablity, believing his record in front of goal is fine for a wide forward.
However, the ex-midfielder believes he will never get into Solskjaer’s first-team and this could led to him being disruptive in the long run.
Muphy told White and Jordan: “He’s got 78 goals in 260 games as a wide player, which is generally what he is, he sometimes plays through the middle, he played through the middle yesterday. A one in three goal ratio is not bad at all for a wide man.
“You could argue that at a top club you should be doing that, and he should. Now is he in United’s best XI? For me, no.
“If they want to win the league and become competitive, does he get in their best XI? No.
“Is he the type of squad player you want in terms of numbers, somebody who comes in and can score goals and make goals, irrelevant of his body language and what you think of him? Yes.
“The problem with him is that he could be a bit – I’m making a judgement on what I see from him from afar, I don’t know him – of a bad apple. Somebody who brings the mood down.
“We sometimes look at players and see what we want to see. Dimitar Berbatov was a great example of someone who didn’t look like he particulary tried as hard, even though he was wonderfully gifted.
“When you look at the numbers of Berbatov, his running stats and stuff, he was always up there with everyone else. It was just his style, the way he looks.
“Sometimes players, aesthetically, don’t look very good and some look busier than others.
“I think Martial doesn’t help himself with his body language at times. I don’t think he’s particularly a great asset in terms of the team togetherness, the unit and the squad.
“Sometimes he looks like he’s sulking and when he comes on as a sub sometimes he looks like he’s annoyed and he doesn’t want to be there.”