They're also 50 years old.
If that's your idea of what most of psychology is like, then I imagine you think 90% physics is all about things like phlogiston.
Just because there are some very well-known experiments that were very poorly conceived and conducted does not say anything about the field as a whole.
As someone who works in tech for a psychology department, I can tell you from a decade's experience that a) the people there care very deeply about performing good science, including replicating results, pre-registering papers, and doing good statistics (not p-hacking), b) there's a lot of psychological research that's decidedly unsexy, very much about things like proving what we already intuitively know to be true or sussing out small nuances between X and Y, and c) while they teach about Milgram and his ilk, it's almost entirely in a "What Not To Do" type of way.