I too find the MBTI profiles a bit saccharine & "emotional", but I admit they were good enough to catch my attention & consider INFP as the forerunner for my type.
I think that the MBTI profiles seek to appeal to how many INFPs see themselves; they feel far more than they appear to, and that is often true of myself. The problem is, other people expect INFPs to appear that way, and then you have them mistyping people or having a distorted view of what Fi is.
Paging Seymour (next time you login, please find this): did you not once quote a book which had a semi "unflattering" view of Fi, but that would ring as true to most Fi-dom? I want to say it had two authors, if that helps in recalling it....There was a great description of the indirect "influence" a Fi-dom can have over people, which Jung compares to a "spell".
I agree it is definitely NOT a system of values....but a Fi-dom may create such a system, as a "byproduct" of its thinking style & focus. I know for me, I don't have any set of clearly defined "values" in the way many think Fi operates though. That's too much like rules; too much like Fe. Having a system of personal values does not mean a person uses Fi thinking; but it's common misconception.