I would say that Brynhildr is quite casual. There are definitely some hardcore raiders though.

One thing I have learned is, don't expect to do much endgame content via PF. Out of the 3 types of people a) under-performing, b) jerks, and c) neither I'd say the neither category is quite small. That said, I've played in end game content with a lot of great people on this server, so just form a static or find a close niche and you're good. (I guess this is directed towards your brother).