...regarded Lizzy's first impressions, but since you brought up Charlotte, I agree that she misjudged Charlotte in at least one way (just as Charlotte, who some hold up as a model of a good observer, misjudged Lizzy), but it was the type of mistake that a lot of people make. We all tend to think that people we like are more like us than they actually are.

I agree that the others may not have required any great perception. However, Caroline and Louisa are described as able to be charming when they wished, so yes, they did fool other people, not just Jane. And some people were apparently overawed by Lady C based on "the mere stateliness of money and rank" and failed to notice a lack of "extraordinary talents or miraculous virtue," which Lizzy was aware of.

Lizzy may not have an extraordinary record judging people on first impression, but she does seem to have a better one than most of the people around her. Maybe that's not saying much, but I don't think that the text supports "a tendency to misjudge others at first." At worst, she is no worse than most people.