What exactly constitutes good architecture?
There is, perhaps, a dual sense of "goodness" of the architectural production.
First, good in sensiblity, applicability, and constructablility - that is to say, good in a material sense. Buildings which are worth more than their constituent material parts.
Secondly, good in the sense that the building betters people's realities; promotes some basic sense of self in space as related to a current moment of society.
Architects, then, find themselves entrusted - or not trusted, as it often may be - with political, and moral decisions as well as pragmatic ones.