I just re read that article and this portion hit a chord:
They call these "Variable Ratio Rewards" in Skinner land and this is the reason many enemies "drop" valuable items totally at random in WoW. This is addictive in exactly the same way a slot machine is addictive. You can't quit now because the very next one could be a winner. Or the next. Or the next.
I remember in wow, every day I would spent and hour or 2 killing these dragon whelps, because they might drop the dragon whelp pet. It never dropped it for me, and I dont even want to know how many hours I probably put into that venture.\
Theres also some other great articles on that site the "7 video games commandments"
http://www.cracked.com/article_16196_the-7-commandments-all-video-games-should-obey.html
on bullshit weapons:
"Gordon, the whole world has been taken over by a race of malevolent aliens. All of humanity is depending on you. Here's a goddamned crowbar."
"How hard would it be to randomize facial features and skin tones? That's what we want, to feel like we're killing hundreds of different people. Not a bunch of clones or twins. We want to know, deep down, that there are hundreds of grieving mothers out there, lamenting the terror of our dreaded blade. "
This brings us to our second category of "enough is enough" gaming elements, which are ones that sold truckloads of games, but that need to be retired. Such as ...
World War II games.
The average gamer has killed more Nazis than the entire Russian army. Where the hell are the World War I games?