IMO; people who play call of duty 40 hours a week or more should be considered in the hardcore category. I am willing to even bring this down to a 32 hour a week stand point. My thoughts are if you put as much time and effort as a part time / full time job. That makes you hardcore. Nothing is wrong with being a hardcore gamer, but you certainly are not a casual gamer. In my mind, A preachers gonna preach, a haters gonna hate, and a gamers gonna game. That's what it boils down to. Let me know what you think.
here is the link if you would like to read the article so you can know what I am talking about.