Bayern are not favorites in the Champions League right now, but they are definitely one of the contenders. Everyone is trying to remember Arsenal's amazing results in the Premier League, but the Champions League is a different tournament and Bayern is a team of a completely different level. As far as I can compare these opponents, it is clear to me that Bayern are superior to Arsenal, despite all the difficulties that the team has had to go through this season. Besides, every team has its downturns, and it may be good that Bayern went through this difficult period earlier, as far as their recent results are concerned.
Let's not forget how rough this season have been for elite teams this season. Most of them have been fighting for prevailing path this season, regularly been denied and this also affects Bayern Munich. They're among the promising clubs this season but they're not achieving zero title this season, really a rough and tough one for the Bavarians. Perhaps they're not the only elite team affected, all other elite teams facing difficulties this season, Bayern Munich who happen to be the Bundesliga giant is also affected, they lacked the necessary winning qualities of a formidable team.
The firing Bayern Munich have declined in performance, they no longer have the potentials of competing in the UEFA Champions League this season. Though Thomas Tuchel is trying his best to ensured things run smoothly for his side, Tuchel happens to make it to the list of been one of the terrible managers to handled Bayern Munich, the board working on his replacement because seeing him staying for another one season will spell out doom for the club.