First, to answer your "title" question: Why do people enjoy these kind of games? Because, as sad as it is, on average people are... basic, to be kind. Look at how much utter garbage becomes a phenomenal success without any claim to quality of any kind. Of the top of my head: The Transformer movies, Twilight, The Harry Potter movies (not to be confused with the books, which are actually good - also not to be confused with Twilight which is utter crap in all it's iterations), 90% of pretty much anything on MTV, MW2... If we start looking into it, the list is nearly endless.
On average people are like magpies, they chase the shiny things... Even if the shiny thing is a glossy turd.
As to the point of your article: I can understand where you're coming from, but I can't disagree more.
Don't get me wrong, I'll always welcome things like tutorials and good level design that doesn't simply assume you've been playing all your life. Valve is a good example of BOTH sides. Portal is a great example of good game design, as you're slowly eased into gameplay to the point where, by the time you're in the really hard puzzles, they feel easy as everything just comes naturally to you. Portal is the kind of game where you don't even notice how far along you've came until you look back, which is good. On the other hand, TF2 is about as welcoming to newcomers as a frontal collision with a brick wall.
"Pick a class!"
"...what? why? What class? what do they do? W-"
"Shut up and pick one ffs..."
"... ok...this one..."
"Ok, now kill stuff!"
"...what? how? I j-"
"Too late. You're dead. You suck."
Tutorial levels, incremental difficulty and such... All good. The thing is, there's a line to be drawn between "making things welcoming" and "dumbing it down". Yes, gaming requires you to learn a little about computers or consoles. Yes, it involves a time and money investment before you can collect your "return"... Here's the thing: Anything worth having is worth fighting for.
Sure, skate boarding is hard. I did some in my time. I wasn't particularly good to be quite honest, but I knew a few tricks. I never did a 900, but I could do some basic tricks, and it was awesome. It took quite a considerable personal investment to learn the little I did, but here's the tricky part: I had to. Under your line of reasoning, I should have just stood on the board and gone straight. I mean, sure I would never do anything even mildly similar to pulling tricks, but then again, I wouldn't have to try either!
You don't get to enjoy the feeling of a killer solo without some years of practice. You don't get to enjoy flying, if temporarily, without several months, sometimes years, of painful practice. And you sure as hell can't expect to enjoy a masterpiece without at least knowing the most basic stuff of the medium it's in. It's like saying "Sure guys like Shakespeare, Edgar Allan Poe and Ernest Hemingway could write some interesting stuff... But you couldn't really enjoy it unless you knew how to read well. Some of their stuff is really hard to read... Perhaps they should have written it with simplified language so everyone could understand it. Like, fourth grader kind. Maybe do small comic books instead. Maybe Caesar could have been a 20 page comic? Simplified version for people who didn't understand the intricacies of the language so well...". Douglas Adams' works are very accessible, vocabulary wise, but if you can't read you won't understand a single page...
Sorry, if you want quality, you need to invest in it. Otherwise you get... Well... Zynga...
Raising accessibility is nice, dumbing down isn't.