For what it's worth, I won't mind questing being faster if it's restricted to unrepeatable quests so that you can only get one class to L50 using such quest experience. I'd be happy with a quick road to L50 on one class and then a slower (but still reasonable) road to L50 on the rest of the classes. Basically, I hope levequests aren't faster than grinding when you're in a large party. Questing - and levequesting - should definitely be faster when you're going solo, no matter what, though!