They are good for one thing: If your manager says anything other than "Keep up the good work!", you know that (a) they don't like you, and (b) they're working o

They are good for one thing: If your manager says anything other than "Keep up the good work!", you know that (a) they don't like you, and (b) they're working on getting rid of you. Extremely valuable information if you know what to do with it.