All the steroids in the world won't get you as big, muscular and conditioned as a top pro or top national level amateur unless you have good to great genetics, IMO. It takes a combination of good bone and muscle structure, the right kind and number of muscle cells and muscle fibers, and some important metabolic factors like high insulin receptivity and igf-1 receptivity.
I see guys who get huge, ripped and muscular on minimal juice, training with surprisingly light weights. I see other guys who juice, train and eat like maniacs, and they just get big and blocky.
Dorian Yates is an example of someone with decent genes for mass building, but not a particularly aesthetic body shape. He overcame this and rose to the top with really smart training and nutrition and lot of hard work. He's not a "genetic freak" like Kevin Levrone or Flex Wheeler, but you couldn't really say his genetics were "poor" or even "average."
Athletes at the top of their sport, whether it's Barry Bonds or Ronnie Coleman or Terrell Owens, have genetic advantages that are at least as great a factor in their achievement as any drugs they might take. So sez me.