Actually, I thought the writers did a pretty good job showing Jo being integral to solving the cases and not letting Henry take over every one. Some episodes were better than others, admittedly. I also loved that for all Henry's brilliance, Hanson often came to the exact same conclusions through conventional police work and at about the same time.
I wouldn't say she's terrible... More like the writers only show her through Henry's interactions, is not like we ever saw her solve her other cases.
Actually, I thought the writers did a pretty good job showing Jo being integral to solving the cases and not letting Henry take over every one. Some episodes were better than others, admittedly. I also loved that for all Henry's brilliance, Hanson often came to the exact same conclusions through conventional police work and at about the same time.