The fighting in Vergalid Mines was far more pleasant, but dealing with the groups of 4-5 mobs which come with the Overseers/Slavemasters/Slavedrivers (all give credit) outside of Vergalid can be a pain if you're a Warrior or other crowd-control-lacking class like me. Here are a few tips that are not all specific to my level 67 Warrior-Shaman two-box team that died a few times because I didn't use some of these tricks:
-Gauge how far apart the mobs in the pack are and pull the leftmost or rightmost mob in a given group, not necessarily the slavedrivers themselves. In some places, this will pull less than the whole pack. Pulling the slavedriver almost always pulls their whole pack due to their more central location in it.
-Make use of your disciplines--don't hold anything back, you need what you've got for every one of these fights. Stonewall and Defensive are particularly effective; Fortitude plus Whirlwind Blade (for a little aggro) at the start of a fight can be good if you have a debuffer with you, to give them time to Slow/Cripple/whatever the mobs. If you use Stonewall, remember that you can strafe faster than you can run with this discipline active if you need to chase an add that has gone after someone else, and you can't walk backwards at all.
-Unless you have some good form of AOE aggro, your healer mercenary will steal aggro on at least some of the mobs now and then, especially early in the fight before your tank has aggro on everything. Let her tank some of them; she's tougher than you are (but keep an eye out for her heals being interrupted). At least, she was tougher than my Warrior with full auto-granted AA and elaborate-intricate-flawed consigned defiant gear from the Hero's Journey, who is pretty tough. (If you're not using a healer merc, obviously, ignore this.)
-If you have any form of Root, use it and move away! You might even use it for pulling, if you can follow up by using something like Whirlwind Blade to get all of the mobs' attention before they all beat up your squishier Root-casting characters. I was an idiot and didn't use my Shaman's Virulent Paralysis AA or her Root spells.
-If you're a tank like me, you can and should be switching targets and landing Incite (or whatever your class's primary aggro ability is) on more than one mob (since its refresh time is shorter than its duration) in order to maintain aggro.
-This may seem obvious, but med up before each fight. You may well need it.
-Bring a friend. I wouldn't have been able to do this at level 67 with just my Warrior and a healer mercenary.