Basically, what I'm seeing are large packs of players sitting or running around (again, in large packs) laying waste to any NMs found. Not only are the NMs senselessly squishy, but they're being zerged non-stop. Find an S-rank mob? Don't worry, it'll instantly become a Behemoth/Odin-esque lag zone in under 30 seconds as everyone pours in from every corner of Eorzea, and just like Behemoth/Odin, if you're not there early, you get no credit. Ever.