Soul Lashers are pretty annoying, but not as annoying to me as the Lacuni. I don't know why. I mean when they lick you, I can just Spirit Walk right after and run or toss a Horrify to get them off. But that might just be because I haven't gotten the worst of it yet. Or I was just blessed enough not to have seen too many of them.
And I don't know why, but the oppressors never really bothered me as much. Unless they're elites or something with waller/jailer. That might change while I try and progress my Wizard, though.