I hate to admit it, but I was a partial WoW addict at one time. I had to continually work through the games almost tedious grind to level 60. Then 70.
Having not made it to 80, I don't feel I've an accurate opinion on WotLK, but good for me, I'm not going to be talking about gameplay. Or WoW in general.

*Side note - I have experience in Guild Wars, Final Fantasy XI, and WoW.

The MMO player mindset.

So, basically, you play MMORPG's. And, if you're like I once was, you play them a lot. Perhaps multiple ones, maybe just one, it doesn't matter. You've got a specific idea when you play the game. That you want better gear, you want better abilities and you want to own yourself some n00bs.
For me, this process was long and drawn out. For you, perhaps it wasn't and you are, currently, the maximum level in your MMO of choice. Now what? You're going to continue playing, day by day, trying to get some better gear. You could grind for gold (farming), you could work on your professions, you could raid, you could pvp. Whatever you're attempting, it's to increase your characters capabilities or to increase the amount of fun you're having.
And that's the point, to have fun. If you're having fun, then that's all that matters. For me, I began to think about what I was doing with World of Warcraft. At this time I was level 70 (When 70 was still the level cap), and overtime my mind told me "You're not gaining anything from this." "You're wasting your time with this game, all your doing is getting better gear so you can get even better gear..."
This struck me in an odd way. I was truly just grinding for gear to get better gear. I would PvP and all that good stuff, I would raid, I would farm. And I was having fun. But I soon grew tired, perhaps this was a direct cause of my mind telling me I was wasting time.

And time went on, I froze (halted) my account. I was no longer playing WoW, and I was doing just fine. I didn't feel any regret, I didn't have the need to play it, nor did I have the same interest in better items. But recently, I've been struck again with an almost contradictive thought. I spend loads of time playing TF2, playing CoD, you name it. In these games, you've got weapons and you kill your enemy over online and it's all great. But in CoD and TF2 (With TF2 being a slight exception, but not entirely) you are preset with certain weapons. Sure you work your way to get some new weapons, but the task is such a simple one, it hardly feels painful.
I realized I was doing no worse in World of Warcraft. I was accomplishing a goal, to get better gear. I was having fun with friends. And I spent not much more time on it than I do other games nowadays. I've wondered if my sudden disinterest in WoW was due to the poor public opinion many gamers have on the game, or perhaps I finally got bored...

In the end there's really no reason to condemn an avid WoW player for enjoying himself. You are doing no better playing your CoD's and your Halo's. I enjoy all these games, but in them, you truly are accomplishing almost nothing that will carry over to real life. WoW = CoD = Halo = Forza. It's preference, and in an ideal world the WoW player would not be the more nerdy of them all, but, in this world, it just comes with the territory.
Sure I can give you a run down of the level 70 arena gear names, how the stats can benefit you, good specs for your class, and I could throw you some lore, but you're learning no better in CoD.

Perhaps you could give me a run down on how many bullets your P90 holds in a single clip, how many clips you can carry with Bandolier, give me the names of all the weapons, tell me which is more powerful, and give me a complete overview on the story.

Or not...