The two correlate pretty well, in the end, it's just one fewer dimension. MBTI's problems are in large part how it was conceived and how it's presented, being rooted in Jungian psychology and being presented as a firm binary when each axis more or less has a bell curve distribution, making it inconsistent from test to test. But the underlying categorisation and test methodology isn't very far off, even if it's by accident, and I think people only hear about the problems and throw out the baby with the bathwater.