Warnock believed Madley must demonstrate Hornets striker Troy Deeney a yellow card while sliding for the chunk at the 2nd half after he collided with goalkeeper Neil Etheridge.
“I cannot know why we had Andre Marriner whilst the fourth official, and a referee who has perhaps not refereed a match all season [whilst the ref],” Warnock told BBC Sport.
“unless it is because we have been Cardiff and they state we might truly have a Sunday trainee or some body?”
Madley had been refereeing his initial Premier League match of the season, if he took charge of Watford’s 2-2 draw with 32, having made his debut.
The 35-year-old contains 100 Championship matches and plenty more Football League and FA Cup matches to his name and has mainly refereed in the Championship this season.
“Troy have to have been booked,” said Warnock. “I really don’t know why we need to be the experimental side.
“Can it be because they feel sorry for us? Or feel we are not essential?
“you cannot tell me Marriner wouldn’t need give Deeney a card of some kind. It had been a tackle. We encircle the referee and usually do not lineup. When I see teams eliminate things, I am upset by it.
“He [Deeney] may have pulled early doors or never put his claws up. A card was justified by it. I am disappointed to possess an referee. At least it gives him training and is terrific due to his assessors.”
Three nice goals from Jose Holebas, Gerard Deulofeu and Domingos Quinas saw Watford cruise using their competitions demonstrating no match for the Hornets to get much of the match.
However, with 10 minutes staying at Vicarage Road, Junior Hoilett hauled a seeming consolation goal before Bobby Reid added a moment to give a pleasure of an unlikely point to Cardiff.