The Gunners sit eighth in the Premier League table and are already 11 points adrift of leaders Manchester United after just 11 games.
Of this summer's arrivals only Santi Cazorla has excelled with the jury remaining out on Lukas Podolski and Olivier Giroud.
Arsenal supporters are desperate to see Wenger sign some big names, but Wilshere had been impressed by his manager's work in the transfer window.
"It is strange because last time I played was with Cesc Fabregas, Samir Nasri, Alex Song and Robin van Persie," Wilshere told Arsenal Player.
"Now there's the likes of Podolski, Giroud, Cazorla and Mikel Arteta.
"The boss has done excellently. He's bought well. These players are proper footballers - they understand the game and they've been around.
"You look at someone like Lukas Podolski, he's got over 100 caps for his country.
"They're top players and it's easy to come into a team where they understand football so well.
"To play with someone like Santi Cazorla is so easy. He understands football, even little things like the pace of the pass he gives you, and his movement is outstanding."