I just think everyone has there own definition of hardcore and causal and there is no use trying to define them. To me a Hardcore gamer is like my roommate. Every single ounce of free time is playing WoW. He's running raid with guildies, or doing Pugs. He's always getting his arena cap when the day when the reset is. Has multiple arena teams. He constantly PvP's in his free time. He know every in and out of the game and is always reading up on it. To me that's what a hardcore player is. A causal (again to me) is some one who flirts with the game. plays here and there doesn't have the time to get to cap, and frankly doesn't want to put in the time. They have other important things to do then to play the game and probably have others they're playing but they're not putting time in it. It's like the parent who bought Wii fit and use it randomly. Everyone else is in between to me. They might have a little of both traits but for the most part are average gamers. They play infrequently, and go hard at times light at others. I think this is where most of us fall. I believe Hardcore and Causals are just extreme of gamers (the very vocal minority). TL;DR We all have our own definitions for Hardcore and causal gamers. Mine are Hardcore are OCD, Causals are the "that's neat. Moving along" crowd. Both extreme minorities of average gamers which most of us are.