This is expected to happen. The VERY EXACT same thing happened when apple's ios store was introduced back in like, late 2008. SO many crapapps, so many redundant apps of things that were already in the OS itself and worked fine and weren't beneficial to use. It took several months before it got useful, a year later or so brought some big hitters to ios. Maturation was needed, and it happened and now ios has EVERY top app that android users would want and Windows Phone users want and demand as well as maybe some Windows tablet users.
I think the same thing happened with android, except many apps were pretty much ported over to android, others were on android that were used on jailbroked iDevices that apple didn't approve.
Windows Phone development interestingly enough, compared to initial starts of the other two, is the second fastest after ios. There are some REAL nicely done apps on it like MetroTube, USA Today, The Weather Channel (on Nokia Lumia phones) MyStocks, Skype, Newegg, and others. Some of those developers brought their apps over to Windows 8, but the Windows apps are just paled in comparison to the Windows Phone counterpart. It's not there yet in terms of design and functionality. It seems since Windows 8 brings the tablet form factor front and center, they must be thinking development works similar to ios and android almost.
It will take 6 to 12 months for the Windows Store to mature. It needs developers, developers, developers, developers, developers, developers, developers, developers! App stores aren't overnight wonders, just look at the mac app store, there have been more downloads on Windows Store in the four months it's been out than mac os's store. There are also Desktop app listings as well to bring more options available.
Also, the article is a tad skewed as by default, apps are shown by being noteworthy, not top paid. Noteworthy apps are the ones to be concerned about, for example under Entertainment, there are some pretty nice apps that I have installed and use daily, and some I've used on a touch screen as well.
But the Store UI REALLY needs better metroizing. That's too modern and bare versus a rich lush metro design that Windows Phone Store has.