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I think they are fun.
In this case, you have to kill the mobs, not the boss. The problem is, the mobs don't spawn if you kill the boss too fast. Especially when you have two raids of 60 people attempting to coordinate. It leads to comic chat.
In any case, it is nice that you have no instanced that separates players in this world so you can have these types of events.
And this happens every 2 am and 2 pm ingame time (a few hrs apart). On one of the lowest populated EU servers.