In the past, I did the tests multiple times and always scored as an INTJ. There were a few things I really found to be true, but also a few that were not typically me. Also, some things I find important are not described or mentioned in the MBTI description at all.
I still think the MBTI thing to be similar to the Zodiac signs: certain traits might be true for many people with the same personality type, but others are not. So, it's certainly funny and interesting, but I think it's better not to take it too seriously.