Benefit #1: Gain more experience – You get bonus experience by completing instance quests while you’re instance leveling. You get the experience from killing creatures inside the instances as well as plenty of bonus experience from completing the instance quests. Additionally, completing instance quests grants you twice as much experience as completing solo quests, so for every instance quest you complete you get the experience comparable to completing two solo quests.
Benefit #2: Better gear upgrades–Instance leveling will give you more chances at getting better gear since the gear that the bosses drop is better than anything that’s out in the solo world. Also, the gear you get as a reward for completing instance quests is much better than the gear you get for completing solo quests. This means that you have two chances to get a gear upgrade every time you run an instance. Additionally, if you run a random instance instead of queuing for a specific one, you have a third chance at getting better gear because you will get a bag of helpful items after you complete the instance.
Benefit #3: More fun interacting– Instance leveling gives you a chance to explore parts of the game you would never see if you skipped this option. The instance quests used to be the ones that WoW players purposely skipped over because they required finding a group to complete them; however, the dungeon finder does this for you and takes all the guesswork out of finding an appropriate group, no matter what time of day it is. This makes all those instance quests a whole lot easier and more fun than they were before. So not only do you get more experience and better gear but you get to interact with other players while completing your quests.
Benefit #4: Convenience and practicality – Since you’re already planning on instance leveling anyway, it certainly makes sense to complete the instance quests. Seeking out the instance quests may take a little more time but having a good instance leveling guide can take some of the guesswork out of finding them.