"The 'feel-good factor' is down to the quality of the spirit of the team, the solidarity of the players, and their desire to do well.
"We know we are a team that looks like being successful for that you need a special hunger and I believe these players have a special hunger.
"I believe in life you can always improve and that is what makes a top-level sportsman or a top-level team, is they always have that surge for improvement.
"I believe that collectively in the way we win the ball back and the use of the ball offensively, we have room for improvement, for more consistency in that and that is what you want from the players."
Arsenal will tackle last season's European runners-up in a double-header on match day three and four which could well shape the outcome of Group F.
The Gunners are currently top by three points following back-to-back wins over Marseille and, most impressively, Napoli.
"It is not a decider, but it is an important one," said Wenger of the match at Emirates on Tuesday.
"It is an 80 per cent game for me, for the qualifier. If we win the game and we win the other home game, we know we are there.
"The German teams, they have a desire to play, they play with a positive attitude and they have produced as well many good players recently.
"They don't hide, we don't hide, so it should be an exciting game."
Arsenal will rest midfielder Mathieu Flamini as a precaution following a concussion he suffered during the Norwich match. And England forward Theo Walcott remains sidelined following a minor setback after surgery on an abdominal problem.
Wenger indicated he would rotate the starting XI somewhat, given the amount of matches facing his squad.
However, the Arsenal manager expects nothing less than full-on commitment once again when they tackle Jurgen Klopp's well-drilled side, which will be spearheaded by Poland forward Robert Lewandowski.
"What is important is that we go into the game and focus on our quality, on our performance. For me that is more important than focusing on Dortmund," Wenger said.
"[We want to] come out of the game and feel that we have played at our best if we do we will be difficult to handle for everybody."
Edited by Oliver Pickup