The Brazilian arrived at the Emirates from Chelsea this summer in a move which was widely praised as a positive signing for the Gunners.
However, it has been a dodgy start to life in north London for the 32-year-old who has not kept a clean sheet in his four Premier League appearances for Arsenal so far.
He was criticised for his performance in the 3-1 defeat to Liverpool at Anfield last month and was at fault again against Watford on Sunday as he felled Roberto Pereyra in the penalty box, giving away a spot-kick for the second time in his short Arsenal career.
Republic of Ireland international Cascarino has been scathing of the Gunners display at Vicarage Road as they tossed away a two-goal lead to draw 2-2, specifically calling out Luiz for his lack of positive influence.
Cascarino wrote for the Times: Arsenal had no control, no composure. They needed to sign a defender this summer, someone who is cool under pressure and has leadership qualities — and they went and spent £8 million on David Luiz, a player who has never embodied any of those qualities.
Arsenal had been in total control at Watford, leading 2-0 at half time, but defensive mistakes cost them two points after the break.
Before Luiz gave away the penalty, Sokratis Papastathopoulos was at fault by giving the ball away in his own box, allowing Tom Cleverley to score.
Cascarino believes that little has improved since Unai Emery took over as manager last summer as the players are not capable of carrying out the Spaniards plans.
Emery has been at Arsenal for more than a year and, while they have improved in some areas, the same problems remain, the 57-year-old continued.
Last season we were talking about whether they had the players to always be passing the ball out from the back, and we are still having that debate now — it must be infuriating for Arsenal fans to watch and I dont see it changing anytime soon.
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