Boring is subjective. What's boring is doing NM trains for 10 hours. But NMs were meant to be rare bonuses that people uncover by accident or whatever. It wasn't meant to be a train fest. The idea was to chain mobs together in full parties, moving from mob type to mob type as you increased in level just like you would in a dungeon, but less of an obvious endpoint compared to a dungeon. It was meant to be more casual than a dungeon but slowly allow you to get free gear that's on par with Sigmascape equipment minus the weekly lockout.