Where do you feel aikido is lacking in that martial feeling in general. If it has not been your intention to intimate this, apologies.
I'm not David but I want to answer this anyway. Aikido lacks pressure, simple as that. Realistic attacks are a first step on the road to achieving under pressure, but are only a first step since all that is being practiced is 1 attack/1 response, end. The pressure ends for the defender after the first attack has been received. Pressure needs to be continuous for reality.