There is a lot of discussion about the "effectiveness" of Aikido, especially when compared to other forms of martial arts. It seems to me that the focus of comparison is always regarding of what you can do to others from the point of reference of control and martial application or "effectiveness" of technique and NOT from what the practice of Aikido actually does to you internally and externally as a life changing discipline.
Aikido is not a combat sport designed for fighting and competition, it is a practice of harmonizing energy within yourself, others and the world. And in order to do that, we must become flexible, adaptable, empty and leave fear, ego and desire to control others behind. If your Aikido does that for you, then my friend, you have found the most "effective" practice in your lifetime. A practice that will transform you and will develop your evolution as a human being.