Why are there no great Windows 8 apps? Because of WinRT. A developers view
Let's face it, there are no great apps for Windows 8 and the number of trashy apps is also very low compared to the Android and iOS ecosystems. Microsoft looks really desperate to bring more apps to the ecosystem. Instead of improving the API and its capabilities Microsoft just generates desperately looking campaigns to improve the apps count. I sometimes wonder if they ever realize that the number of apps is not important when people cannot find the apps they are used to use on Android or iOS in the Windows Store.
So why are there no great Windows 8 apps? I will tell you my opinion and my experience. I tried to develop a few great apps but many of those projects never got done. The reason is the API (WinRT).