[anecdote]
I was in a game shop with some of my friends the other day and we were discussing latest releases, and what else was there on show.
A quick divide started to emerge. I pointed out the bioshock looks and sounds like it is pretty awesome, I don't even own an Xbox 360 or PS3. Another friend of mine quickly agreed, confirming that it didn't just look it, it was awesome. Then a third friend was like wtf? never heard of it. He has owned a 360 for a long, long time. I was confused how this could have passed him by.
Then we move over and notice COD4, again I don't own it but I know that it is awesome. A 4th friend, who I knew was a COD4 addict, proceeded to launch into a long speech littered with tales of awesome sniping, jumping out, getting jumped and shitting himself, etc. Again the friend who hadn't heard of bioshock, butts in with his story of how he played the campaign for COD4 twice, couldn't see the point in keeping it and so traded it in. I asked what he got in return, he presented to me Pure. A quad-bike racing game. I knew it would be the sort of game I had no interest in so as I feigned interest in it, I tried to figure out why on earth you would want to make that exchange. I resigned myself to thinking that it did look quite good for what it was.
Finally we notice the display xbox 360 is free, and there the split becomes clear again. Half of them, noticing FIFA 08 was what was on rush over to it and start a mini-tournament and begin discussion over whether pro evo or fifa was superior, the other half amble over dreading the impending boredom.
The final nail in the coffin was when I decided to conduct a test. I bring over the orange box. Half of the people look at it already familiar with it through experience or general gaming knowledge, saying nothing. The other half exclaim, "WTF IS THIS SHIT?".
I had to acknowledge that although my friends were gamers. Not all of them were real gamers.
[/anecdote]
Like someone said above, there is a third catergory between casual and hardcore. The people who play games a lot of the time, but only own a small amount, and think that FIFA 08, Rock Band and Halo 3 are the best games around at the moment.
Interestingly I forced the same friend who'd never heard of bioshock and had got bored of COD4 to play a long session of Timesplitters Co-op with me and he loved it.