He makes too many generalizations and putting everything into 4 groups doesn't represent reality very well, and his need to put things into 4 makes him exclude other things from his work making what he writes boring, his cognitive styles which is one of his ideas that seems more based on how people really think didn't seem really clear to me because he didn't take the base/creative subtype system into account. He's very factually inaccurate and he's very imprecise.
EDIT: I meant to post this in general socionics discussion.