"My advice to those critics is to shut up, sit back down and enjoy the rest of the tournament," Wade told The World Game.
"People have been getting into Ange, saying he has used too many players, the results have been bad, we weren't getting anywhere, but he knew what he was doing all along.
"The results weren't the important thing in all of those games we played leading up to the Asian Cup, it was what Ange was trying to achieve with the style of play that mattered.
"He has come up with a style we want to see, and which can get results, so we're on our way in this tournament now."
Wade believes that while it is natural to assume the Socceroos will only improve on what they did against Kuwait, they won't have to get that much better to emerge from the group with a perfect record.
"I can see them getting out of the group with nine points," he said.
"It's going to be interesting to see them against Oman, but the game I really want to see them in is against South Korea.
"I base my prediction on what Australia did in the first half against Japan in Osaka in November. Ange was still trying a few different players there, but we dominated the first half. We lost 2-1 in the end, but the signs were very good.
"I don't accept the criticism of Ange that he used too many players in his first year as coach. He was trying to create something and we're seeing the results of that now.
"I was very optimistic after I saw the Socceroos play at the World Cup that we would win the Asian Cup and I've seen nothing since to change my mind.
"Even at this stage, Ange might still not be absolutely sure what his best starting XI is, but that's a good thing. It means he's got plenty of worthwhile options to consider."
Wade welcomed Postecoglou's decision to hand younger players like Massimo Luongo and Trent Sainsbury a start against Kuwait, while veterans Matt McKay, Alex Wilkinson and Mark Bresciano missed out on starting berths.
"That's why he has used 44 players in 12 months," Wade said. "He's been looking for a change in personnel and a balanced team and the chance to try to play some of that football he was so successful with in the A-League at Brisbane Roar.
"Luongo's header for that goal was something else, and he took it right in front of Timmy Cahill, who was rising for the same ball. People have been complaining that Cahill is the only one who scores goals - well, maybe Luongo's goal was a sign of the future right there.
"The goals were spread among four players, which was great, and we've got a goalkeeper in Maty Ryan who aimed up when he was called on to make a couple of great saves.
"If you've got a goalkeeper you can really trust it adds to your confidence when you take the ball forward."
Another great sign for the ex-Soceroos skipper was Nathan Burns and Tomi Juric coming off the bench and being immediately threatening in attack.
"They both could have had goals. Burns could have had two," Wade said. "Look, that's probably an area in which the team could improve across the board, taking chances, but if you keep creating opportunities you're going to get plenty of practice at it.
"Even in those lead-up games when we lost, they still created plenty of chances. It's going to be important to have a regular goal-scorer for when Tim leaves the international arena, but the guys coming into the team now are showing good signs and there is time to work on that.
"Right now, the scoreboard is not the most important thing. It's about trying to play the way you want to play and letting the performance dictate the result.
"The players are buying into what Ange wants to do. Their movement against Kuwait was good. They were getting free to receive the ball and they were making runs into dangerous areas and putting the defence under pressure.
"Credit to Kuwait, they came out with a plan and they executed it very well early on, but the Socceroos didn't panic even when they fell behind. They got on top and won well in the end."
