The problem is that with such an uncertain performance, Bayern could once again miss out on the Champions League title. Last season, Bayern also looked great from the start (and in the Bundesliga too) - they scored a lot of goals but also conceded a lot. The pattern is repeating this season, with Bayern risking get an inconvenient/lucky Champions League opponent and be knockouted early on.
Well the good thing is that we are still so early in this season, so i would say it is way better to have a series of bad results and maybe even a bad performance now then later in the season in april and may when the very big and very important games are played in the playoff round of the Champions League.
That being said, i think it is highly likely that Bayern will miss out on the Champions League title this year. Not because they are bad, i think they are one of the big favorites, but still it is just so hard to win this title. Just look at Manchester City they were the best team of Europe for the last 3 years now or so and they will have not won the CL. You also need luck to win it.
Luck is not something concrete to talk about.
You cannot take it as a parameter though , october are indeed a nightmare for bayern ... that's why there is a rumor that tuchel prepared to take this job or he might take the old lady juventus job as allegri might be in danger to leave the club . Anybody interested in betting for the next manager to be fired?