I think it is important to distinguish between the MBTI itself, and the ideas behind it.
Personally, I don't think the MBTI is worth much. It is not a bad introduction to ones own preferences, but does not seem to measure them well or consistently.
On the other hand, the ideas in the Myers-Briggs theory have helped me greatly in understanding myself and others. For example, I'm heavily NP, while someone I've had close interactions with is a strong SJ. This has helped me deal with this person, and get a clue about what is going on when they seem to be acting (from my naive point of view), nonsensically.
Personally, I don't think the MBTI is worth much. It is not a bad introduction to ones own preferences, but does not seem to measure them well or consistently.
On the other hand, the ideas in the Myers-Briggs theory have helped me greatly in understanding myself and others. For example, I'm heavily NP, while someone I've had close interactions with is a strong SJ. This has helped me deal with this person, and get a clue about what is going on when they seem to be acting (from my naive point of view), nonsensically.