Bayern Munich always been a tough team in Champions League, unfortunately they're in tough bracket since they will meet either Real Madrid or Manchester City in order to enter final round.
It is during the QF draw that teams would know the opposition teams that they would possibly meet on their way to the final, mind you that after the RO16 fixtures are over and we now have 8 teams, there would be another draw, that is when you can know the teams that would face who in the next rounds, but for now that's not possible and you can't know if Bayern Munich would face either Real Madrid or City in the next rounds.
Bayern Munich have to face a team that necessarily is strong to enter the final game. A witnessed teams like Inter and Chelsea which were less favourite in the previous years that went through the final eliminating stronger opponents and made it to the finals.
Bayern Munich will face eventually Manchester City or Real Madrid or Inter or another good team later after winning against Lazio which are in bad forms. I think Bayern Munich shouldn't wish to face an easy team, they have to eliminate every rival they face to win the title. This year, many teams dropped in performance, including them, so they might pick this opportunity once they improve themselves.