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One thing I've noticed about all quest-based MMORPGs is that I really have no motivation to complete any quest beyond exp/loot. The game makes no effort to personally involve you in any quest, and most of them feel like you're just helping some idiot with something he could have done himself.
"Help! Rats have infested my cellar and ate all my candy! Kill them!"
"Help! My entire party got wiped out by bandits, but I'm sure you can kill them all by yourself and avenge us!"
"Help! I need 10 bat feet for my soup but I'm far too lazy to get them myself!"
All of these examples are pretty typical, and I seriously don't care about any of them.
SPRPG quests on the other hand are usually MUCH more involving (good ones at least) because they try to personally connect you with your character so you WANT to do the quest. Here is an example from a JRPG I recently played (made generic to avoid spoilers).
First, you are introduced to your characters female friend and are shown a cutscene of their blossoming romance, you also learn more about their history together during some normal adventuring. You start to care about the characters at this point. Later, your town gets attacked by huge mosnters and your female friend tragically murdered.
At this point, I actually cared about doing the quest, because I wanted to get revenge! I didn't even care about exp or loot...and I think this is what quest-based MMORPGs are missing. There's no effort to actually involve you with your character so you care about doing these quests...they just turn into chores.
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