This sort of thing is infectious and it usually starts with the flight school management. If the owners or managers care about their operation, have a good time, and enjoy the people around them, then the people working there will be similarly infected and probably have a good time, too. So should you. This is not to say that the place, or the CFI, should not be businesslike. Professionals know their skills and how to apply them.
Some people are just better students than others.
Then, too, people have bad days on practical tests, even the best applicants. The answer is it depends. It depends upon whether the personality of the CFI you get meshes with your personality. Where you go does matter. If you, discover that you are not progressing, make a change.