Of course, it's subjective.
Maharaji made it very clear that people call him a Perfect master because he teaches something perfect.. The idea of perfection in a human is obviously relative - what is the perfect height for a human being, is a baby who falls over imperfect.
You seem to think that Maharaji is supposed to be physically, mentally and emotionally perfect. No thinking person would ever believe that.
Is he a perfect teacher, he is to me. Is my partner perfect, my partner is to me, is my child perfect, he is to me.
I'm not expecting absolute perfection from them, just perfect for the situation in which I exist with them.