Dortmund lacking ruthlessness
This could perhaps read as a comment on both this game and the previous game against Barcelona because the same themes from that game carried over into this one. The visitors had 16 shots at goal of which 7 were on target, and that perhaps undersells the number of good chances created by Dortmund on the day. Yet, they came away with only a point.
Dortmund need to start finding the back of the net more regularly and kill off games before teams make them pay for it, as Frankfurt did in this instance. Though, that's only a part of the issue.
During certain points in the game when Dortmund were in the lead, they tended to dop their level and allowing the opposition into the game instead of grabbing it by the scruff of the neck and putting it beyond doubt. They continued to create chances, but not like a team that was hungry to put the game to bed, rather as a byproduct of just the sheer quality of the side. They may need to change their mentality to finish these games off earlier.