Snap judgments like "love at first sight" or "instant hate", if taken seriously, have usually been considered signs of immaturity or lack of common sense. (Para. 2)
Meaning: If they are taken seriously /If they are believed to be worth paying attention to, snap judgments have been thought to be signs of not being mature or not having common sense.
n. 未成熟;粗糙;未臻完美;不完全