Of course, that usually comes from the team who the decision has gone against and which they consider unfair.
A complaint has never been heard from the side that has been favoured.
Although VAR has contributed to more justice in terms of correcting refereeing decisions where required, it has also generated a lot of noise.
We highlight the most controversial decisions:
In the Sevillian derby there was a crucial incidents in the match in which theVAR intervened.
Betis goalkeeper Pau Lopez was ready to put the ball in play and forcefully collided with Roque Mesa.
Gil Manzano sent the midfielder off.
At the conclusion of the match, Pablo Machin made a tough statement, which days later was denounced by Velasco Carballo, president of the Technical Committee of Referees.
"It's aggression from the goalkeeper, I give my player all the right to do this, they arbitrate in the bar," said the Sevilla coach.
In the 35th minute of the match, Pere Pons was hurt by a blow to the head.
Gil Manzano let it go, but the game was interrupted at VAR's request.
The review of the play changed the initial decision of the referee, and Clement Lenglet was red carded for aggression to his opponent.
Sergio Busquets complained at the conclusion of the match.
"The VAR would have to be used correctly and with the same criteria," he noted.
Ernesto Valverde also made his malaise with the system clear.
"It's the first expulsion in which the player who makes the mistake asks forgiveness," he added.
Real Madrid-Atletico Madrid
In the Madrid derby there was a possible handball from Casemiro that wasn't punished by the referee Martinez Munuera, nor reviewed by VAR.
Atletico Madrid requested a public clarification on the application criteria of the video assistant and, in addition, Simeone also offered his opinion.
"What do you want me to say... There are four of the VAR upstairs, four down... they can make mistakes as everyone is wrong..."
A possible penalty decision that wasn't given in the 95th minute generated the storm.
Angel Torres, president of Getafe, exploded against the decision of Iglesias Villanueva and also against the inaction of the VAR.
"The VAR is paid for by the clubs and I demand an explanation of what has failed, so that I don't look like an asshole," he said.
Later, he implied that there was a plot against his team.
"I know that they want two teams from Madrid to go down," he suggested.
Antoine Griezmann scored from the spot to make it 2-0 against Valladolid.
Undiano Mallenco gave the maximum penalty after he was told of a handball by Kiko Olivas in the area.
The referee from Navarre went to the television to see the repeated play and after doing so, didn't hesitate to point to the spot.
In the 81st minute, with Atletico winning 3-2, Valladolid called for a penalty against Arias, but this time Mallenco didn't go to the monitor and the locals complained about that.
Valencia missed out on two points at Ipurua for a handball inside the area that was missed by the official but picked up by VAR and then punished with the maximum penalty.
The forward Rodrigo complained about the lack of uniformity of criteria with the referees.
Espanyol managed to win by the minimum against Eibar thanks to a set piece.
Mario Hermoso scored, but the Basque players complained because they considered that the referee was wrong to grant the corner kick that the goal came from.
"We thought VAR was going to solve all the problems, but it's not like that, the referee can't ask if it's a corner or a goal kick," Mendilibar protested.
In the game there was a play that determined the final result of the game, when Zaldua hit the ball with his hand.
The players of Leganes claimed a penalty, but Munuera Montero ordered them to continue playing.
Mauricio Pellegrino expressed his disagreement with VAR at a press conference.
"When they explained VAR, I thought it was a great help. Why hasn't the handball play been analysed?" he asked.
Huesca narrowly missed getting a victory against Valencia.
They were close to achieving a draw, but were out of luck, and even claimed a penalty that the referee didn't give.
Coach, Francisco, protested to the referee.
"He told me that it wasn't very clear, there was nothing to be done now, but I wanted an explanation, and I think VAR hasn't been fair to Huesca."