These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Anticlimax Boss: Quite a few. Most of the named quest mobs can be soloed easily and the solo instance quests group the player with NPCs so monstrously powerful that they would be able to finish the quest on their own if their AI was a bit more competent. Thulsa is the biggest example. Despite being the main antagonist of the story his divine form only has standard crab BAM melee attacks. His right hand woman Akasha and later ally Killian at least have unique wipe moves.
Base Breaker: Thanks to the Reaper class being limited to just the Elin race (while also requiring a level 40 character to even create one in the first place), there are players that feel like the Elin get too much attention from the developers and don't believe that the In-Universe reason for why only the Elin can become Reapers is enough of a justification for the class to be race locked.
Quite a few of the costumes available for players to purchase have a strange effect on the female Amani (and only them): these costumes have a tendency to make the female Amani's normally tree trunk-like legs (that end in what are basically clawed "elephant" feet) into much more slender, feminine-looking legs, which ends up making them look odd. Needless to say, this caused some amount of backlash, especially from fem!Amani players.