The Bavarians needed 45 minutes to get warmed up against the Reds and Sammer slammed the team's apparent lack of hunger and desire.
"We are playing lethargically at times, playing football without any emotion and just going through the motions," he said.
"When you are struggling in the first half, then you've got to help each other out in the tackles and bring a bit more emotion into play.
"Instead, we are too relaxed and just watch - we've won five titles in the last 15 months, Franck Ribery's been named Best Player in Europe and he'll probably also win the Ballon d'Or.
"It's not that we are not working, just we're not showing any emotions at all."
Plenty of emotion was shown in the dressing room by coach Pep Guardiola during the interval at the Allianz Arena, but Sammer suggests such interventions should not be necessary.
"It's not on that Pep has to raise his voice all the time," Sammer said to reporters.
"Our coach always has to give a heated speech before we get going."
Sammer jumped to the defence of the new coach, whom he feels is taking too much responsibility away from the players, who are taking advantage by not delivering the goods with the same degree of hunger they had last season.
"It's all about Pep. Pep here, Pep there, Pep's great, Pep's poor - we're finding it all great because we're no longer in the limelight and this affects you subconsciously," added Sammer.
"We're all hiding behind the coach."