Ok, so the big problem is that many people seem to either hate everything about AA/NA, OR to love everything about it and feel it is THE only way to quit an addiction, when in reality it is not so black and white and it probably greatly depends on the specific group you attend and, obviously, on whether it's the right approach for you as an individual at that point in your life.
However, I do not like when people say it's the only way and say things like "you're not really clean/sober if you don't go to AA/NA," or, "using comfort meds to help alleviate withdrawals can't work for anyone and you're clearly NOT ready to quit if you want to use them and can't yet see that NA is the only true way to quit," or "you're guaranteed to relapse if you don't attend 12-step meetings," or "AA doesn't fail, except for those few people who are incapable of being honest with themselves," and so on - these are word for word things I have heard from AA/NA proponents, I'm not even exaggerating.