WMH: Since I read some of your other replies as well that said it caused wipes, they are for sure in the wrong. While DPSing is encouraged, healing is still the more important bit, even more so in pre-50 dungeons.

BLM: Already been talked about a good bit. I will say that I've actually been kicked for using LB on a non boss/early (Copperbell normal, before the second boss who lb isn't very useful against.) So you haven't been the only person to find it annoying that someone uses it on non-bosses. That said the only boss that should be waited on is the final boss (and even then, you'll probably still only get halfway to level two in many cases these days.)

Bard: Just something that has to be delt with, Shield Oath areas will make it easier. After the flashes you can go and swap between targets with your enemity combo skills, should be enough to keep everything on you as long as you didn't pull more than four. After shield oath/post-50 flash becomes more important to use alot but thats another day.