Instancing is the backbone of
MMORPG if you ask me. You have the whole world to interact with the rest of the assholes. You need those instances to build bonds with the few people that you want to interact with on a regular basis.
I do believe that in games like
WoW they should enact a Lvl cap for Instances tho. I am tired of seeing and being asked to run a low lvl thru an instance that he should be in a group for but dont wanna take the time to do it like I had to back in the day. It would mean more to the guy if he actually had to fight to get the loot instead of someone running him thru...