Aubameyang has struggled this season at the Emirates but has impressed previously since heading to the Emirates in 2018.
He scored 22 Premier League goals in his first two full seasons with the Gunners though has found the net just three times this campaign.
And while Ferdinand is bemused as to what has happened to the former Borussia Dortmund star, he admits he would have loved to see him at Old Trafford.
Ferdinand told his FIVE YouTube channel: “What is the problem with Aubameyang?
"How has he gone from being one of the most potent strikers in the Premier League if not in Europe, to what he’s doing now?
“How’s that happened? It’s not the Aubameyang I know. I don’t know how Arsenal fans are defending him.
“That is the biggest thing for Mikel Arteta, the biggest thing Arteta needs to do right now is to get him playing again.
“He’s got all these young, exciting prospects, you just want Aubameyang there around doing his stuff as well.
“I love Aubameyang, I think he is an unbelievable player who I would love in my team.
“I would have loved Manchester United to buy him before he went to Arsenal, I think he’s a top, top player and a ridiculous finisher.
“What he did last season was unrivalled, but this season Arsenal need him firing, ASAP.”
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Arsenal boss Arteta has defended Aubameyang this season, saying: “We can’t keep putting all the weight on Auba’s shoulders to score the goals.
“We need contributions. The midfielders need to score more and give more assists, and we need goals from our wingers as well.
“Laca [Lacazette] is in great form and has scored five goals in his last four games, which is what we need from our strikers.”