I think that awkward, resistive newbies give a us glimpse of what kind of response aikido techniques will generate when used on someone who is not an aikidoka. (For example, have you ever noticed how common it is for beginners to twist out of shihonage if it is not well applied?) So I tend to consider this kind of situation a valuable, if frustrating, training opportunity.
That's true to some extent. Unfortunately their attacks are usually so terrible that they don't really model a real world attacker, either.