Just tried the fargodeep mine on shifting moon. Definitely too many spawns, way more than blizz had in TBC. I couldn't even get in the entrance . When it got to three npcs that was more than it should have been at that point, but maybe bad luck, but then it got to 5 and that is way out of proportion. Also, spiders should not be getting to the mine entrance which is compounding the problem. It may also be the aggro radius, but I think the primary issue is that they respawn too quickly.