Well... just about all quests in Aion are badly designed, but there is one that stood out more than the others. I received it when my Cleric reached level 17:
Yup, that's right, I have to resurrect 100 fallen allies. If you are wondering what the problem with this quest is, then hang your head in shame!
What's the fastest way for a Cleric (healer), who is responsible for keeping the entire group alive, to get 100 resurrections?
"Oh jeez, sorry buddy... went afk for a sec... here let me rez you.."
"Sorry phone rang, don't worry I've got rez"
You get the idea...
A good cleric would never let a team mate die (on purpose). So in actual fact, the quest is punishing the player for being a skillful healer. Furthermore the reward of 20,000 kinah is only really a large sum to a low level char. Once you pass 25 or so, you are making 20k or so off every quest run (drops alone). By the time I credibly resurrected 100 team mates, my character is likely to be level 40+. At which point the reward is useless.
Like I said, bad quest design.