Well, it's a helluva lot better than a horoscope, but it doesn't come close to something like the MMPI-2. Then again, the MMPI-2 is something like 5 hours long and requires a licensed professional to interpret the results, whereas the MBTI can be taken online for free. So, yeah, it's mostly for entertainment. Also, it doesn't really test for personality, but rather for how each individual processes information, which can be helpful to a degree, but I'd still take it with a grain of salt.