the wiki should just be limited to basic info.... doing a quest is all about atmosphere anyways you want to talk to the npc and go out looking for his request then get back to get a sense of accomplishment
but if the wiki had info about quests concerning who's giving it, where and what he needs and a small hint as to where that is such as if your looking for a flower the hint could be something like "It's rumored that the Children of the Cathedral are giving out flowers. No one knows exactly where they get them but speculation hints at an underground hydroponics facility." that tells us to talk to a purple robed asshole or go out looking for something that doesnt exist if the hints would be limited to something similar to a riddle it will prevent quests from being too easy to figure out.