I suck gorilla testicles at ABD, and I haven't the slightest inkling why (I guess it's because i just suck, period).
I also agree with snake in saying that classic aikido is better (in the subjective sense) than ABD.
To subjectively answer your question, Sworen, most of the people in TGS are beasts at ABD. Two of my close friends in this community, Qubic and Fancy, are also adept at ABD.