Talking about Champions League experience, I don’t think Bayern current squad have enough Champions League experienced players that will scare Arsenal, only Muller and Nuver were among the teams that were defeating Arsenal in the past, the rest of the players were all new and similar experience with Arsenal even though they have played in Champions League one or two seasons before now.
I don’t know what you are meant by Champions league experience but i just know they are far more experienced than Arsenal and that alone means alot. Having Neuer and Muller in their midst will be beneficial and that is something Arsenal will lack, having an experienced player among will help carry youngsters along.
Come to think of it, Bayern have players that have quite some experience in the champions league aside Neuer and muller, there is Kimmich, Alphonso Davies, Sane, Goretzka and Harry Kane who have had quite a good experience in the Champions League and compare to Arsenal’s squad I don’t think any of them are near in terms of experience.
Arsenal cannot be underrated because they have good players and good coach so I expect them to play well against Bayern.
Bayern in the Champions League as a rule never spared their opponents and dealt with them harshly without hesitation, but this season for Bayern is really quite average, both in the Bundesliga and in the Champions League. They look ok overall though, I don't know, it's like that tough core they've lost
In my opinion Bayern is not performing averagely just that they are performing not up to their usual standard and the fact that Leverkusen is beating them to the league makes people think they are performing avaragely, although they are quite inconsistent with their performance but I doubt if they will take the inconsistency to the champions league.