There's an easy test:
Ask her if she thinks the 5 men she spends the most time with or interacts with the most are all generally honest, loving, industrious, and protective. (Or at least try to be so, some men are physically disabled, or something.)
Usually, if she says "No", you can assume that she has serious character flaws. Not because she is misjudging the men around her, but because she is judging them correctly.