Manchester United stars resemble "different players" under Ole Gunnar Solskayer after pulling Arsenal from the FA Cup, says BBC analyst Ian Wright.
United won all eight matches from the former Red Devil striker since replacing the fired Jose Mourinho in an initial six-month contract.
Alexis Sanchez, Jesse Linggard and Anthony Martial scored their 3-1 win at the Emirates Stadium on Friday.
"We are seeing huge performances," said former striker Wright.
The United were much better than Mourinho's dismissal in December after two and a half years. The performances under the Portuguese were perceived as negative, as United approached the area of first place.
"Manchester United looks like different players, and the way they play could not be used by Jose Mourinho at the end," Wright said.
Former United defender Phil Neville said on BBC One: "I thought there was a gap between the two teams.
"In the beginning people blamed Ole for winning easy games, then went to Tottenham and won [two weeks ago]Players who do not perform under Jose now perform the way we knew they could.
"It was a brilliant performance from United, and I think what we've seen from Ole is that it's more than just giving people love, it's tactical awareness."
With United 2-1, Solskayer brought the strikers Marcus Rashford and Martyl in an attempt to finish the game – the latter scored a goal.
"The two substitutions at the end ended the game, it was a brilliant performance from United," Neville said.
"The Biggest Audition in the History of Football"
Gary Linneker, the matchmaker, agreed, saying, "They look happy, they look as if they enjoy football, that's antithesis to what they were at the beginning of the season."
Molde Solskayer's manager was initially hired by the end of the season, with United planning a permanent meeting in the summer. The Norwegian is believed to be struggling for full-time work.
"What Solskayer has done is remarkable," Linneker said. "This is perhaps the biggest audition in the history of football in many ways."
"This is a classic Manchester United"
Solskayer, who scored 126 goals in 366 matches for United, said his country "looked like a good team."
And he was pleased with their two goals of breaking through Lingard and Martial.
"Of course we worked for protection and counter-attacks," he told BBC Sport. "This is classic Manchester United – a counterattack, Wayne Rooney, Cristiano Ronaldo, Park Jung-Sung – in Arsenal we have put in so much over the years.
"We showed them a video about old classical purposes.
"Today was a big step forward, it was a huge improvement from the Tottenham game, it's easy to get excited and talk about the future, but we just have to keep working and think about the next game."
Lukaku, who put two goals in an unorthodox right role, was asked if it was fun to play in the team of Solskjaer.
"That's right, is not it?" – he said. "Today we have a clear direction and I am very pleased with the victory and the way we played.
"Look at the club's history, we make a statement wherever we go, we expect to dominate and create as many chances as possible."