Bingo -- it isn't different, in that respect. I often withhold criticism, but try to express praise, even if indirectly. Especially in a byzantine government agency, the power games and politics mean that one has to be very careful to leave someone a way out, or not attack overtly -- one may be applying to that person ten years later for research funding.

Watching old "Yes, Minister" episodes could be useful, if exaggerated somewhat.