IMHO your Aikido is effective if
a) it gives you something, anything positive.
b) a) includes the ability to survive a physical fight.
Unfortunately from my uneducated point of view, while there are certainly "lines of attack" in Aikido training, the actual "lines of attack" in a real-life fight are not sufficient to make any use of them.
They barely extend toward you at all, just enough to hit, and impossible to evade.