When evaluating the realism of characters in Aliens vs Prometheus I believe that certain allowances for the tone of the film have to be taken into consideration. Aliens does play out like an action film to a large degree so yes the characters are oriented in that direction. For what its worth, Hudson and Hicks are much more realistic in their milieu when compared to a biologist whose first instinct when confronting a serpentine alien life form is to go all "Hey buddy" and treat it like a pet. IMHO, of course. - Walter.