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.
YMMV: Dream Of Mirror Online
Game Breaker: The "Sara Nurse" is a pet that you can summon in addition to your regular pet, and spams healing and buffers to the owner. It's blamed to be the single reason of the reducing number of teams in favor of solo players, and borderline cheating. It doesn't help that Saras have been promoted for a long time, making them really common amongst high level players.