The thing about the last year is that I doubt even the now better Bayern would have been able to in that if we don't consider direct matches with Bayer.
In the last season, Bayer was undefeated and lost only 12 points in 6 draws, right now current season, despite being the first Bayern has lost 9 points in 15 games, basically if they lose 4 more points they can't reach the 90 points Bayer won out of 102 possible.
So, the bottom line is that even right now Bayern is performing worse than Bayer was doing last season.
Bayern Munich doesn't need to go through the entire season unbeaten for you to know they're having a great season. Yeah! I know you want to compare the performance of Vincent Kompany's men this season with that of Xabi Alonso's men of last season but the truth is that despite not playing unbeaten, Bayern Munich have been the best performing German club this season as well as leading the league table. If the league happens to end today, Bayern Munich will be crowned champions of Germany and that's what matters most. In the history of the German Bundesliga, no other club have won the league unbeaten except Bayer Leverkusen of last season so I think you should cut down your expectations and enjoy the good and entertaining football Bayern Munich is offering this season.