The fact that Dortmund made it to the final shows that they can't be ignored here, they have been going against odds to get to the final but one thing is sure Real Madrid won't be sleeping especially from the fact that this is Toni Kroos last dance, they won't be sleeping and they are not the kind of team that slip off after winning a title, I believe that the defeat of Bayern Leverkusen will even make Ancelotti and his squad to be cautious of Dortmund.
You are right that Dortmund reaching the final is a testament to their ability and fight. Their journey to the final shows that they are not a team to be underestimated, this shows that Dortmund is really ready to face Real Madrid in this Final match. Of course Real Madrid will not waste this final match and will definitely play very aggressively to win this match to become Champions League champions this season. The defeat against Leverkusen was indeed an important lesson for Ancelotti to always be aware of the opponent's attacks and pay attention to the opponent's movements and strategies.
Indeed, many parties are favoring Real Madrid in this final match, because Real Madrid is a team that has extraordinary experience and a winning mentality. So let's just wait for this Final match to start, who will dominate the game and become this season's Champion.