The £38million signing was in stunning finishing form as Wigan were swept aside 3-0, and the Argentinian has already struck six goals to keep him on the coat-tails of the top flight's leading scorer Wayne Rooney.
Aguero told City TV: "It was great to get the three goals but the most important thing is that we keep winning.
"A hat-trick is good but for me the most important goal was the first one, as we needed to score."
Aguero could have had even more - he had looked keen to take the penalty compatriot Carlos Tevez missed, and went close on several other occasions.
Aguero's goal-scoring secured him the sponsors' man-of-the-match award but for many at Eastlands it was Spanish midfielder David Silva who ran the game in which City were hugely dominant - and for manager Roberto Mancini far too wasteful.
Mancini said: "We had 15 chances in the first half and we scored only one goal - this is a problem because the game can change any moment.
"Next time it's better if we close out the game in the first half.
"We need to improve because we have started the season very well but the season will be long. If we want to arrive at the end of the season still at the top we need to improve."
Mancini said he was pleased with Tevez' performance despite the Argentinian, who had seemed odds on to leave City in the summer, not being fully fit.
"Carlo is not 100% at the moment but I am happy for him because for me he played very well with Sergio, he missed a penalty but this can happen - usually he scores," said Mancini.
"It was important for him to start, to play and to play well and maybe in two or three games he will be 100%."
Wigan boss Roberto Martinez said it was too soon to start comparing them to Barcelona.
He said: "Only time will tell, Barcelona, when they started with Frank Rijkaard had little flashes like Manchester City showed. In three years down the line you will be able to compare them.
"Nobody can be compared to Barcelona yet, you have to win many titles together first. What's quite clear is that the ingredients Manchester City have mean they have the capability of achieving anything in world football.
"We all know they are world-class players but what Roberto Mancini has achieved is making them play as a team and it is a joy to watch."
Martinez claimed however his players had shown City too much respect.
He added: "I am disappointed with the performance. We showed them too much respect.
"With the quality they have on the pitch and the size of the squad will allow them to be competitive in every competition but in one game you are only playing against 11 bodies.
"We played the occasion too much, we played their squad, when we only had to focus on the 11 players in front of us. We could have hurt Man City a lot more.
"From our point of view it is a real lesson but we still did a few good things that we are going to take into future games."