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Maybe what bugs me (and perhaps you?) about the overly positive ones is that it comes across as FAKE. At least the fault finders are "authentic," even if they are thoroughly miserable....

Yes I think that is it, that it seems fake... I once had a private trainer ... she was always over the top positive , once I invited her for lunch and she actually had a couple of glasses of wine ... I guess she wasn't used to that and all of a sudden her perfect world was not as bright as it appeared ... I think deep down her positivity was some way for her to cope with the things that weren't working in her life ... was kind of liberating to see her being human ....