I disagree with this.. Its for the very reason you state they DO NOT, look at AMF# for example.. You set any specific expectations, and they even falter but a "hair" off course, then everyone under the sun starts complaining about everything..
Its VERY EASY to pick things apart and find the negatives, complain it wasnt done one way, over another, why this and not that, blah blah blah, it goes on and on... Its much harder to stay positive during the dips, holding thru the dredge knowing what you have is solid... Gotta see thru the crap, and look ahead a year or two from now.. Know what you have with confidence..