Yes, I am torn on that issue as well. On one hand, like Green Mantis said, the point of fellowship is that you want to get trained in the subspecialty (not that you already know it). On the other hand, one would expect that if an applicant is seriously interested in hemepath, GI, dermpath, etc, then the applicant has probably spent a good deal of time studying that topic, doing electives in it, etc and that they have a decent knowledge of the specialty.
I supposed if the test is created in such a way as to see if the person truly is interested in the subspecialty, then it makes sense. But if it is being used to see who scores highest and then the fellowship spot goes to that person, then that seems pretty lame (I hope that is not the way those programs are conducting their tests...if so, maybe that is not the kind of program you would like to train at anyway?).