I've noticed in World of Warcraft that I much prefer the quests that are 'find this specific item in this specific place' to quests that are 'kill n of this type of monster' or 'find n of this kind of things that drop randomly from these types of monsters'. It's a similar thing I think.

I wonder if this is a general phenomonen that psychologists have a name for or if it's a personality-based thing.