I'm not really referring to me. I have no muscles, especially in the upper body (like 12.5 inch arms), but I have a horrible appetite (1500 kcals/day) partly due to some ADD medicine I was taking. I'm getting better, though, by eating even when I feel unhungry. I don't know if I'm a hardgainer, but if I had to guess, I'd say no considering I am already gaining weight from eating 2000 calories.
I really was just saying this as a question for knowledge sake. Stripped down I guess I was asking if muscle gain is solely dependant on metablolism, or if some people are more inclined to put the food they eat to muscle gain. It seemed obvious at first (yes) but I started thinking about it and it doesn't seem as obvious now.
Meatwad, who just wants to learn about nutrition