Raiding, including GW2's raids is generally about PVE. It gets boring and repetitive. Whereas in a proper RvR open pvp mmo, the games' events naturally create its own dynamic RvR open pvp raids. For example, right now this week in Champions of Regnum, the realm of Syrtis seems to be dominating the realm war, but in a large disorganised fashion. So the current raid mechanic underway is an attempt by the realm of Alsius to fight hard, fighting back harder than ever before, dying in large numbers without giving quarter. A few Alsius players seem to be leading the battles, slowly teaching newer players how to battle, how to support, and new strategies in timing and how to build and use your characters' abilities beyond the current frontiers. That's the current PvP raid mechanic in the game. Unlike GW2, it doesn't tend to repeat. Next week, next month is likely to be completely different.