Nah, all CSG guilds are definitely casual - as Nemce said of AG, they just offer players the opportunity to do all the life-ruining things that hardcore guilds do as well. Omni is probably the most hardcore guild in CSG and they have one scheduled raid per week and don't operate on DKP. AG and Europa use DKP but don't mandate raiding while you're online or take away your spending ability for having poor raid attendance.
But yeah I'd put CSG as an entity on the top of the "serious casual raiding guilds" list.
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