Wasptrash, you misinterpreted my reasoning. I did not compare CSCS's to MD's, I only used the metaphor to show how baseless I think the belief is that all certifications are useless. And as BoxingFan already pointed out, the ambition of the thread was to distinguish between which certifications are reputable and which are not. Not every certification in the gym is a personal trainer certificate, and not every personal trainer certificate is a scam.
Which is funny in light of your post, BabyPhenom, because when I first asked me boss about CPT's, I was trying to look up all the organizations that issued them (this was overwhelming), and our conversation went such that I asked him about ACE. He got a look of disgust on his face and said, "A joke."
That was actually pretty hilarious because the first CPT he hired (and only CPT at this branch of our chain) is ACE-certified. When I saw that on the card, I came in the next day and teased him about it, but I was really like, "WTF is that about?", you know. Turns out this guy used to be a competitive powerlifter (saw him pop out 6x505 squats the other day like he was stretching) and actually really knows his shit. After telling me this, my boss rolled his eyes at me, as if to say, "I interviewed him, Andy."