I myself am aware of it (part of why I'm so interested in the MBTI is to find my own faults) but I imagine that if an INFJ was not looking for their own faults, they would truly believe that there is someone better out there, and that everything up to that point will be sub-par. I read somewhere that someone had never met an INFJ that wasn't obsessed with the idea of "Soul mates" because we are so concerned with looking for "the one". To get past any problem one must first acknowledge it, and I believe that many INFJ's are not aware that it is even a problem that they have too high of ideals. I myself still haven't gotten past it; I still think "The one" is out there, but the likelyhood of us meeting is so very small... I believe I will work past it eventually (I guess its something you grow out of) but right now I'm still in idealist mode.