Without further ado, here is the list in alphabetical order followed by my personal ranking.
The list of annoying GuildWards player types:
Account Hacker – Using keyloggers and other means, steals players accounts.
Beggar - Uses local or alliance chat to ask for gold, materials that he could get by playing.
Botter (personal) – Runs automated programs to afk farm in-game gold for personal use.
Fanboy – Defends every aspect of the game. Attacks even the mildest criticism.
Farmer – Spends significant in-game time repeating areas for drops.
Gold buyer – Purchases farmed gold from Gold Sellers with cash.
Gold seller (professional botter) – Sells farmed gold for cash.
Guild Hopper - Skips from guild to guild getting what benefit he can before jumping to another.
Leecher – Joins group and then contributes zero. Wants to profit from the work of others.
Local chat Spammer – Repeatedly, rapidly posts the same message killing the chance for casual conversation.
Loner - Anti-social types who only ever play with heroes or solo.
Newb – New player who haven’t learned the fundamentals of the game.
Noob – Long time player who haven’t learned the fundamentals of the game.
Outrager - Uses local chat for racist, sexual, politically extreme, etc. comments.
Perfectionist – Verbally rips teammates who make slightest error.
QQ’er – Complains constantly about every aspect of the game.
Rage Quitter/Saboteur – Gets mad and leaves party high and dry. The Saboteur will try to cause a party wipe instead.
Synch-farmer – Trys to “cheat” the random arenas by simultaneously joining.
Scammer – Prey’s on ignorant or foolish players to get their gold and items.
Scribbler - Draws crude images or fills minimap with rapidly drawn white lines.
Skill Nazi – Demands very specific builds and compliance or won't play.
Title Grinder - Repeatedly performs same activity for sole purpose of acquiring title.
Troll/Griefer – Provokes emotional reactions in others by unwarranted insults and attacks.
Here's my ranking from worst


Truly Loathsome Account Hacker, Gold Seller, Scammer, Leecher
Pretty Horrible Gold Buyer, Outrager, Troll/Griefer
Fairly Annoying Botter (personal), QQ'er, Rage Quitters/Saboteur, Perfectionist, Local Chat Spammer, Guild Hopper, Scribbler, Beggar
Not really that bad Skill Nazi, Synch-farmer, Newb, Noob, Title Grinder, Loner
Confession Time Fanboy, Farmer (occasional)