It wasn't obvious until after they came to power and in particular during the war that the nazis were just as bad as the communists, but by then it was too late. If it hadn't been for far left violence and the Weimar authorities failure to control it then World War Two and all its horrors could have been avoided.
No, chucklefu#*. it was really REALLY obvious to most non-cretins that Hitler was going to be as bad as he was. That is to most non-cretins who rightfully put RIGHT wing violence as the pre-eminent reason Hitler came to power.
All respect to you, but no it was not obvious that Hitler would be anything, but another strongman, he had written a book with very extreme views. But Europe was full of strongmen which had said extreme things. At the same time let's remember that the crimes of USSR was not unknown at the time. So there was a very real fear of USSR in Germany at the time, only made worse by the fact that the Versailles Treaty had weaken the German state's monopoly of force, which had enable the political violence of the Weimar Republic. So there was a demand for a strongman, even if he was a thug like Hitler.