I remember one of the best posts that Tom Prince made on Muscle Mayhem when it first got up and running, it was in regards to being natural or not. He said "who cares, why does every one have to turn someones physique into a 'is he natural or not?' argument?"
The ONLY time it should really turn into an argument is when you have douchebags like Adrain or Achilles trying (and doing so poorly) to scam people that they're natural so they can win something. Pretty pathetic that you can't win shit in life, so you jump on sauce and since you still can't win shit, you resort to lying...and still ain't winning shit.