^ Natima Lang, her students... Mila also seemed a quite straightforward old lady. Some of the military Cardies we've met weren't nice but weren't particularly narcissistic or sycophantic either, just your average gruff military types. Rusot was one such, only dimmer and more prejudiced than Damar. I think we've seen all sorts of different Cardassian personalities, even though we've seen just a small portion of the population, and almost none of them were 'ordinary people'.
Really, is it logical
to derive such a broad generalization based on the few Cardassian individuals who obviously can't be typical of the entire population of billions, since they are distinguished figures in 1) military and politics or 2) secret police.
No it is not. Thank god that we saw such a level of characterization in the Cardassians that we saw onscreen. In fact I would argue that they are the most realistic of the trek races. (was going to say the most human but...)