** Hollow minions of all kinds due to their [[AntiMagic ability to ignore magic protection]].
** Mukkir are ''literal'' demonic spiders.
** Being able to slide around while casting magic was an oversight of the (still intact and in-use) original physics engine. It's been said that Turbine once had a fix ready but decided to leave it out for fear of mage PvP coming down to who fired the first shot (mages are almost game-breakingly powerful in this game) and people subsequently losing interest.
** Being able to PKL (player killer lite, basically standard PvP with almost none of the risks and drawbacks) glitch through a locked door with another player totally ruins any quests that rely on keys or lockpicking.
* ScrappyMechanic: Initially, Spell Research qualified as this. You put a bunch of spell components into a special window to see what happens. You could fail to cast the spell (fizzle) if you either didn't have a high enough skill level, or if you didn't have the right combination of components. Additionally, Spell Economy made it so that the more well-known a spell was, the less effective it became, rendering recipes well-guarded. An Excel macro (known as Split-Pea) was developed to take most of the pain out of the trial and error. Spell Economy was dropped fairly quickly after launch. Later, in mid-2004, Spell Research was dropped as well as having to carry around most types of components, instead being able to obtain Foci for each magic skill that essentially function as every component needed short of Prismatic Tapers and the appropriate Scarab for the level of your spells. The old component system is still an option if you wish to use it, and is even recommended for melee/missile characters that only have item magic for the recall spells. The later introduced Void Magic requires the use of a foci, however, the spells otherwise requiring components that are impossible to obtain such as Bottled Rage.
* TheyChangedItNowItSucks: This contributed heavily to ''Asheron's Call'' 2 death. Fans of the first game just wanted the first game with a modern graphic engine and some online fantasy game staples like mounts and two-handed weapons that were sorely missing in the first game. Turbine produced something more akin to ''VideoGame/WorldOfWarcraft'', hoping to attract a completely new crowd of gamers. It didn't.