I take everything with a grain of salt. I don't agree with what everybody has to say on this forum (INFJ), and I posted a video up on the INFJ personal video section making a comment in the end that I feel that everybody is different even within the INFJ category. I stated that for a reason, because I don't really believe we are all alike at all. (If that was the case, everybody here would've suffered social anxiety, speak multiple languages, have strict parents, are christians, went to a private school, love art...etc...)
I always keeping myself in check and make sure I don't let my own beliefs in the MBTI define who I am, because I don't feel that 4 letters can sum up my experience as an asian american, as a bilingual american, as a minority, as a woman, etc..etc... the list goes on. Like I said even though we may take in information the same way, biology and environment has a lot to do with our makeups and that can't really be summed up in 4 letters.
So to agree with a few posters above, it's just a tool.
Edit: I know people have studied the MBTI system in depth. I have read a few articles, but I honestly don't want to give it more time than I have to. I know maybe 5-10% of how the whole system works... but I have other things that I need to do, so I'm kind of picking and choosing what to invest my time in. If my profession was a psychiatrist, maybe I would take that time... as a design student though, I'd rather read books on design theory and composition.