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One thing I have noticed that got worse with World of Warcraft is the constant questing to progress as solo (because of nobody to group with when leveling) or finding a group and going to instances, but that is a very rare situation if you don't know a lot of people that play and for certain when starting a new character, leaving new players out in the cold. This becomes very tiresome after a long while mainly because your running all over the place doing errands instead of progressing with the strategy required to level. This becomes mindless to the point that you start to zone out while you fight and you start to go into autopilot subconsciously and it is all trivial. This kind of progress - which is done the majority of the time - is considered to be work in my book instead of using your head to figure out how to get through it. It is good for sales because most will succeed but at the same time those people will get exhausted and will not want to keep doing this.
I now have all classes in WoW at 70+ except for the Hunter and after you have played all roles in the game and doing most of the quests, you will have problems finding anything new to the game being that you have played most of the game to this point. To not have a mentoring system like EQ2 and Vanguard, you really are left out in the cold when needing to find a group as well leaving you with only quests. If Blizzard doesn't implement something like this soon, they will have a hard time getting new players to the game. Blizzard better being thinking of these things if they have another MMO in the works.
What I consider fun is Tactics and Strategy as the core elements of games and I'm sure most people here do too. If you find yourself thinking in the short-term and not thinking ahead and coming to the conclusion that what your doing - in whatever game your playing - is just more of the same and it takes a lot of gathering or grinding to get to an unclear goal, then you might be wasting your time, all while paying a monthly subscription. This is a very important thing to examine any MMO game you play before you waste your time. I used to want to get to the max level so that I could run through old camps that I couldn't take before and get their loot to sell or just to have a better character or to have some cool gear I wanted or new spells and better pets. Without these goals and fun combat mechanics with strategy to go with it, you are really just wasting your time.