The winger starred in the thrashing of the Black Cats as he scored one goal and set up four other strikes to help the Saints continue their fine start to the campaign.
"All of the players showed all of the time that they play really well as a team," Tadic told reporters.
"We always show our qualities but to do that somebody needs to defend well, somebody needs to score goals and somebody needs to make assists, but we want to get better and better.
"We want to keep the ball, we want to score goals and we want to keep more clean sheets. I think [Sunderland] is one of the good teams and we can never try to be relaxed and we want to push on from this."