Bayer Leverkusen seems to be a little less good this year compared to last year, but overall they are still very high quality. Technical Director Alonso is still trying to keep the team at a high level. I think they are trying to play without mistakes because they are aiming for the top spots in Germany and the Champions League. Of course, there may be surprise points losses in some matches. Not every season can be as good as last season. Their performance last year was a performance that went down in Bundesliga history.
I think Leverkusen current performance is not in a bad condition compared to last season, indeed they has suffered their first defeat in the league this season but that does not mean they have declined this season, in some of the matches they have played, I see that Leverkusen performance is not different at all because indeed the mentality, performance and consistency that they have are still very visible as a champion team, Even when they are currently 3 points behind Munich at this time, Leverkusen is still a very competitive team for compete to be able maintain the current status of defending Bundesliga championship.
That's really true that Leverkusen is a bit lesser with productivity than they were last season, they had a really good season last season and this season its not been a smooth ride for them as they are still having a few ups and down around to settle just yet but then sometimes they try their best to maintain a good position that will help them maintain a decent stance on the table so should incase they are able to come up with something later on, they wouldn't be too far behind to be able to meet up and probably defend the title.
I don't know from what point of view you judge if they are no longer productive, even though they are currently the second team to score the most goals after Munich, besides last season we admitted that they were unbeaten in the league but didn't they also lose a lot of points by getting 6 draws?