It’s probably just me, but I find the loot mobs to be frustrating. Most often I just find a trail of money, meaning I never saw the thing. If I notice it, it’s already heading into its portal/hole.
I know that I’m not “losing” anything by missing them, but it annoys me that I have to play a specific way (rush in, guns blazing) if I want a chance at them. I can’t play my way, because picking off a few mobs from a distance just alerts the looters and they take off.
And forget tracking them when there’s a swarm of mobs to contend with. Diablo 3 added a message once you engage their loot goblins, even if it was accidental (thanks Jabber!).
And on the few times I managed to track one down fast enough to unload into it, they just shrug off damage the drops badasses and port out. At least the yellow loot ghosts were noticeable before you engaged them.
Anywho, they just feel like something added to frustrate and disappoint players. But that’s just me.