Well, I don't really know how warlocks work in Legion. As a Paladin, the artifact grind is pretty straightforward: get artifact power, level up, get the artifact power bonuses, repeat. But from what I've seen, getting the artifact weapons is pretty easy. Some of them have even pretty nice storylines. It's their upgrading that's tedious...
What do you think about Suramar? I must say it's the most beautiful zone in the game's history but the grind was pretty long.