Dammit. I don't have the patience to type up a long post, go look elsewhere on this site please.
1) malignant tumors that secrete GH do so at a constant low level (like ED subq injects). That is the definition of unnatural and it specifically causes a ton of bad side effects--like acromegaly
2) during adolescence GH is pulsed from the pituitary, and causes much less side effects (except that bone plates are still open, so easier to grow, hence adolescence)
3) the feedback mechanisms for GH are completely different than for AAS. The effectiveness is given by the peak concentration height/valley, not area under the curve. Peptides in general are behave differently than small molecule compunds.
4) people just criticize things they've heard without researching or personal experience...