In response to paragraph 2, my experience is that skeletons dole out about an equal amount of suck regardless of subjob. They certainly can be problematic, and having dealt with them many a time as both melee and mage, I can't say it ever much mattered what people subbed, stunlocking and killing fast enough were the main factors on smoothness. As for slimes, our stunners were usually pretty on the ball. That's not to say that we didn't get hammered sometimes, but that happened before more people started using offensive subs too.