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The penalty was 100% clear, and complaints should be directed not at the referee, and not even at the player who committed the foul, but at the pair of center-backs who completely messed up in this match, essentially costing the team two games.
And also, regarding the refereeing, apart from the fact that Arshavin received a yellow card absolutely undeservedly. After Kan was substituted, there was a moment when, during the chaos in the penalty area, the ball went through the German goalkeeper's legs, and the defenders prevented it from going into the goal. I have the impression (although I would like to see a replay) that one of the Bayern players had the ball hit his hand. And according to modern football trends, that is a 100% penalty. And if that is the case, then even a "satisfactory" rating for the referee would be a gift.