A catalogue of errors saw the Gunners fall behind to Luis Suarez's fifth-minute opener and Jordan Henderson's second-half strike, only for the home side to suddenly click into gear and level thanks to Olivier Giroud and Theo Walcott.
That highlighted perfectly the situation Arsenal find themselves in, with an often scintillating attack hamstrung by a leaky defence.
Bacary Sagna, Thomas Vermaelen and Aaron Ramsey were all culpable for the Suarez goal, while Andre Santos was muscled off the ball by Henderson as he scored.
Fortunately for Arsenal, they did not lose too much ground on their fellow Champions League hopefuls as Chelsea and Tottenham drew at Reading and Norwich respectively, and Wenger thinks they have a lot to look forward to if they can remove their defensive nervousness.
"It was a great football game where both teams went for it," Wenger said. "It was entertainment. We could honestly have lost the game but could have won it by three or four goals difference.
"It shows we created many chances going forward but were nervous defensively. The goals we have conceded show we were nervous from the start. Overall we showed great quality in the offensive period."
It is not the first time Arsenal's defenders have had fingers pointed at them this season and Wenger added: "I believe recent history has an impact on the way we started the game.
"I believe we have to get that out of our minds and focus on playing football and what we want to do to the opposition.
"I believe the quality is there and we have to trust it and forget what happened in the past. What happened in the past, you could see it played in our heads at the start of the game."
