Grotesque. All this messing with genetics makes me nervous. Maybe everything that science can do isn’t necessarily a should do.
To see what lack of myostatin does to a human, look no further than Jay Cutler (who also takes massive amounts of androgens, but nature helped him along the way, too):
I tried to find the article, but Science or one the like magazines did a study on a lot of atheletes and bodybuilders and found most lacked the gene that produced the protein.