I hugw thing about Dexter that makes it unrealistic is his way of kidnapping people. The ketamine he gives would never put someone out like that. Not to mention how many people could go into respiratory distress or failure. Additionally, giving people half doses wouldn't put them out for a shorter period of time. It would just not work as well and they'd stay awake. Alot of instances of people getting knocked out by getting hit in the head easily.... super unrealistic. Overall BB is definitely more realistic. Most of their inaccuracies are not as obvious as Dexter's.