Personally, I find the emphasis that is placed on rank to be a huge distraction. It is the training that is important.
Don't get me wrong; within a school, rank serves its purpose. Also, for those of us who choose to either compete or instruct, rank serves as an important credential. But that is
all that it is. Just as all doctorates are not equal, neither are all blackbelts. Also, just as all doctors don't emphasize the same aspects of medicine, neither do all blackbelts. Yet all are called doctors. It isn't the credential that counts: Doctor Smith may be a fanstastic pediatrician, but does he have the
training to perform open heart surgury? As a pediatrician, probably not. But that doesn't make him a bad pediatrician.
By the same token, does a fifty year old instructor who's main focus is in teaching kids have the training and conditioning to be an olympic athlete and compete in the olympics in taekwondo? Doubtful. But that doesn't change the fact that he's a good instructor.
My point in all of this is that the rank is just an indicator that you have learned a curriculum set as presented by a specific master at a specific school to a specific level of proficiency. Nothing more. I have a black belt and am probably better than some and not as good as others with the same rank. In addition, I am probably better at
some things than another of the same rank, but he will be better than me at
other things.
So when you get down to it, you either believe in your instructor or you don't. If you don't, then simply be done with it. If you're in a contract, fulfill your contractual obligation and then be done with it. If you do believe in your instructor, then stay on, train hard, and take the promotions when they come: he or she is promoting you for a reason. Different instructors place emphasis on different things. For some, the emphasis is on the developement of the mind and maturity, feeling that if the mind is brought to maturity, the training will follow. Others are all about the physicality. Neither approach is wrong, but one will likely be more physically demanding than the other.
A lot also depends on what you're after and finding the
right instructor. Some very good instructors are not the right instructors for some people. And if you're in a class with one of those instructors that isn't right for you, you can still learn from him or her. Study their teaching technique. Take what they have to offer. I've learned a lot from teachers who were not the right teachers for me.
I'll wrap up here; I risk running on if I don't.
Daniel