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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.
I still feel Real Madrid will be victorious
That is the advantage they are going to use to play with Real Madrid, it will make Real Madrid to feel the seriousness from Borussia Dortmund because they will make sure they make their goalkeeper and defenders more stronger as never before just to take victory from the final game.
Before Real Madrid will realize what is happening in the game, it will be too late for them to equalize the goal from Borussia Dortmund which is what I guess it will going to happen to make Borussia Dortmund to celebrate the trophy.
There are many teams to learn lesson from, because Bayer Leverkusen and Manchester city experience such thing in some competition that made their opponent to lift the trophy.