I've played bismarck once, I didnt notice much of his character when I played him personally, but when I played against him as another leader I also saw him as a very negative person.
What fireaxis have done with germany is that they have taken hitler's negative character and implemented it with the face of bismarck. They should have implemented the face of hitler to that guy in the same run, they can't take the personality associations of hitler and use the face of bismarck, its just ridiculous.
Bismarck was not negative like that, he was a happy, joyful guy. This is bad fireaxis policy and wrong game policy.