From my point of view, these are excuses. They are things that only become an issue if you are already dissatisfied. It is very hard to tell what your exact reason for quitting really is. The reason I think I quit is a general lack of fun brought about by a focus on repetitive tasks that I didn't want to be doing. You may say that that is the point of MMO, but I hadn't had a problem with it up until the point where I quit.
The trouble with design by statistics is that it creates the average, which means 50% of products out there will be better almost by definition. Given variance in taste, this number is likely to be even more inflated.