Don't use MBTI to study intertype relations, ENTJs and ENFJs, aren't necessarily compatible to INTPs. But for you as a person, it really does give you a detailed description of your personality. If you look at it in brief, it may not seem trustworthy, but if you research it enough, you'll find out it really is scientific. For most parts except intertype relations, I think MBTI is quite accurate.
Yes, the MBTI is an effective measurement of personality. The MBTI or the Myers Briggs Type Indicator is great at determining your personality. The test itself asks a lot of personality questions that will pinpoint your type of personality. So unless you are just flat out lying on the test, it can be pretty accurate.
The MBTI or Myers Briggs Type Indicator is excellent at measuring and determining your personality. I have taken this test a few times and found it to be very accurate. It asks so many questions about your personality that, unless you flat out lie on the test, it will be very accurate and effective.