Borderline personality disorder is nothing like multiple personality disorder...just to clear things up there.
Many people think schizophrenia and multiple personality disorder are the same too...they are not.

I saw a clip of this show...the guy from Northern Exposure (forgot his name) was on a talk show and was promoting this show.
What did you think of the show? I didn't see it.

No, multiple personality has not been discredited. Our minds can have psychotic breaks and do all sorts of strange and bizarre things if our genetics and circumstances align accordingly (genetic predisposition to mental health disorders and an extremely traumatic experience). They are very rare, but it can happen.
TV does a horrible job portraying it, just like with anything else, but it's real.
That's right, I said it! I wear scrunchies!!

I am a sulfate washing, cone slabbing, curly lovin' s.o.b. The CG police haven't caught me yet.