Yes, I thought Freud was an S. He's quite the empiricist, who then adds a great deal of pseudo-N talk to the data. (He started out as a hardcore data collect for... what was it... hysterectomy patients?)
Many of his ideas seem to be comprised of bits and pieces of data taken from his research but then connected in illogical or inconclusive ways and treated conclusively. N's tend to start with a framework and piece data into it.
I'd at least give him a TJ rating.
My impressinon is that Freud is an INTJ. His system is very intuitive and unprecedented. I don't agree with much of Freud, but his ability to perceive the unconscious is about as hardcore N as I know about. To be able to perceive that in a world where no one did? Doesn't that require iNtuition? He also understood how to elicite information out of people. He understood about how to draw out projection, use stream of consciousness, make connections between people's deep internal symbols. Dream imagery is all about reconciling paradox. Freud was an Ni. Freud was a profound, if at times mistaken, thinker. The one pitfall of iNtuitives is that they may develop an exhaustive, abstract system that is pure unto itself, but doesn't fit perfectly with reality and the concrete world. Hats off to Freud as our poster boy for this.

It is also important to note that most every leader of thought in the early twentieth century was wildly dogmatic, and expecting absolute allegience from their followers. This is true whether it is psychology, harp technique, science, politics. There was so much change in the twentieth century, that people would find a new idea and cling to it with the fervor of a long standing tradition. That was all they knew to do.
I need to read more, but i have suspicions that Jung is an INFJ.
I've been going through my psych book with personality hypothesis.

Most are actually extroverts and there are some hardcore Sensors as well. It's kinda interesting. These two here though are Ni dominant imo.