First off, this post is not about creative writing MFAs, yay or nay.
My guess? Some creative writing MFA programs are probably wonderful, with supportive classmates and professors and the perfect environment where young (or not so young) writers make amazing progress on their craft and start finding their voice. Some are probably horrible, with lots of backstabbing, in-crowd cliques who love nothing more than to rip the writing of other students to shreds and/or vain, narcissitic professors who demand adoration, mimicry and absolute devotion–or else. Most programs are probably somewhere in between.