Most of this Guide is obviously geared towards Pickup groups or Guilds that haven't yet established Raiding parties. If you're in a group that already works, you probably don't need this Guide. But what if you're in a group that doesn't work, and there doesn't seem to be a way to fix it?
There are basic "incorrigible" personality types that will destroy any group.
The Accidental Aggro-Master (Affectionately referred to as 'Leeroy')
This is the guy who's always running off from the main group, pulling Adds on the group from every direction.
The Family Outfitter
This guy whines for every single piece of equipment, because "he has a brother who needs it."
The Rambo
This type of player has an irresistable urge to go and kill mobs, and believe in their god-given invincibility. After each kill, they immediately go off in search of the next one, not caring what the rest of their party is doing. Usually results in their death and party wipe, and is almost always followed by "Where was my heal?"
The Secret Agent
Periodically announces "BRB" and disappears for a few minutes at a time. Often makes up for his absence on his return by running headfirst into the next mob without warning the party.
The Lone Wolf
You never even know who this guy is, because his locator dot is always half a zone away.
Speed Racer
The inevitable member who runs at top speed towards every chest, Quest device, or shiny object in the Instance, usually resulting in Adds, a scattered group, and a Wipe.
The Jackass
The guy that complains about everything. He's usually a Warrior complaining that the Mage is "rolling on all the Cloth items."
The Habitual Disenchanter
He will beg for every magic item after the roll in order to disenchant it. Does not understand the concept of money.
The Ninja
This jerk is related to the Speed Racer, but also will roll on every BOP (Bind on Pickup) item wheather can use or not, AND will grab every chest/item he/she can. There have been instances that this type has waited till everyone else has passed on an item, then pick it up and hearth home. These types deserve KOS.
I Can fit people to people on this list Including myself.