That's according to Paul Merson, who has praised the Spaniard, but he has told the faithful gunners to keep their expectations low.
Emery signed five players during this transfer window while reorganizing his squad.
Stephan Lichtsteiner, Sokratis Papastathopoulos, Lucas Torreira, Matteo Guendouzi and Bernd Leno were selected.
Merson praised Emery's transfer business, but doubts that veteran defender Lichtsteiner is a regular starter.
"The head of the Arsenal, Unai Emery, signed five players this summer"
"He bought players they needed," Merson said on Sky Sports.
"He needed defenders, he bought experience in Lichtsteiner.
"But, 35 years old, how many 35-year-olds play in the Premier League? Especially in the back.
"But he has bought experience, it's going to be different." He needs time. "
Arsenal will receive the final season winner of the fugitive title – Manchester City – tomorrow.
Then they have a trip to London to face Chelsea at Stamford Bridge.
Merson says his former club could be in the relegation zone after the opening matches.
"I could not have wished for a worse start, Man City at home, Chelsea out," he added.
"They could be in the last three after two games, which would be a shame for the manager."
"Tomorrow you will see a team that will make it very difficult for Man City to knock them down.
"It will not be like in the old days where we have an opportunity, you have an opportunity."
Speaking before tomorrow's curtains lift with City, Emery said he had complete confidence in his players.
"We are working very hard in time for Sunday to show our ability and our mentality, and I want to win this game because it is important for us and the players to have confidence," he said.
"I have a lot of confidence in myself and I want to convey that to my players.
"For me, this is a new way and a new process, the past is important for this club and the people who work here, but we are starting something new with the same players.
"We will keep many of the good ideas that they were already working on here, and we will also contribute more to improve the tactics.
"We need to maintain the positive energy we need and create a new way and a new process."