"Yeah, so what you need to do is walk down this road here until you get to a big hill. Then you want to take a right and continue until you come across a lake, at which point you want to walk clockwise around it, and you won't be able to miss that Giant that I want you to sort out for me." OK, thanks. Just give me a second whilst I adjust the little arrow on my mini-map until it's pointing up...and off we go!". It would seem strange to have both detailed instructions about quest locations and an arrow in your mini-map homing you straight to the location. Perhaps you need to listen to the NPC's instructions, and only when you are near the desired location will the little arrow appear on your map, pin-pointing you to your location?
What do you guys think? Will NPCs giving you detailed guidance on where to go be a waste of time if you can just skip through their dialogue and follow the arrow on your map?