There's the endless problem with the word "casual" right there.

Way, way, way back in the Vanilla days, Casual/Hardcore actually did refer to time spent, not necessarily skill. Vanilla raiding had a huge time investment need. A couple days a week wouldn't cut it. Not surprisingly, the terms have morphed over time. Casual can mean anything from "limited time" to "just plain bad" these days. Hardcore varies from "works really hard" to "elitist jerk." Depends who you are talking to. And who you are talking about, for that matter.

I define my guild as Casual. We raid 2 nights a week, 3 hours a night. We don't take attendance. We let people spec they way they want. (Unless it would be a serious detriment to the raid, say a fury warrior trying to tank Nef. Or a feral druid raid healing. That's just silly and if a raid is REALLY doing that, you deserve to wipe.) We're 11/12 right now. We don't raid crazy hours. We don't spend the rest of the week farming or rolling alts. Most players have one main. Only 1-2 have raid-geared alts, which we don't require, they just like to play multiple characters.

So we're not Casual because we're competent players? That's ridiculous. We take a very relaxed look at the game. We play to have fun. We don't care if we get to Heroics. We don't play insane hours. We are Casual. We're just not bad.