Gullibell has it about right.
Although i would suggest that you could have an exceptionally qualified instructor who does not give a hoot for his students.
OR
You could also get a relatively inexperienced instructor who gives all he has to offer. All he has to offer, even in his spare time.
god help us if you get the wrong combination of the above: eg an inexperienced instructor who does not give a hoot.
Which country are you from? because over in Jaaland we are short of instructors.
Good luck either way.
PS, cliche alert!: You will get out what you put in
